Split-sole footwear

ES 2 540 787 B2

DESCRIPTION

SHOE AND MANUFACTURING METHOD OF SUCH SHOE

Related request

The present application claims priority from United States Patent Application No. 13 / 207,397, filed August 10, 2011, entitled Split Sole Footwear.

Description field

The present description refers to footwear and more specifically to split sole shoes.

Background

Conventional footwear has structural limitations that force the user to make difficult choices between style and comfort. As a result, many individuals endure significant foot pain, or choose to wear less attractive shoes or styles that may not be suitable for the occasion. To solve this problem, some women carry extra shoes in the car or a large bag. However, a conventional replacement pair of shoes is less than ideal due to size and bulk limitations in portability. Lightweight foldable or roll-up shoes are available that offer increased portability. However, such products do not contain the desired support, durability, comfort, or style of a non-collapsible shoe.

Furthermore, folding shoes of the prior art have outsoles that do not adequately protect the midsole and upper of the shoe, leading to premature wear of the shoe including tearing and damage to the shoe. Additionally, such shoes are typically flimsy or, in other words, do not provide adequate protection or support for the foot. For example, many folding shoes have a total elastic constant that is, depending on the brand and model, between 0.551 kilogram-force / cm (0.14 kilogram-force / inch) and 0.134 kilogram-force / cm (0.34 kilogram -force / inch). Such shoes provide little or no resistance, protection and support, and thus are unsuitable to be worn for repeated or prolonged use, particularly outside or on rough terrain (eg dirty pavement, stones, etc.). Furthermore, such shoes are not strong enough to last at least a normal shoe life even with only moderate use. Therefore, while some shoe designs have attempted to bridge the gap between full-time and wearable shoes, there is no practical solution left.

In prior art shoemaking processes, outsoles are sewn onto a midsole. These outsoles are at the bottom of the shoe and protect the midsole and upper from wear and tear and provide additional support and stiffness to the entire shoe. After the outsoles have been sewn, the midsole is sewn to the upper and an insole thereby forming a single seam. This single seam runs through the perimeter of the shoe and essentially outlines the upper of the shoe from the midsole. While such processes are advantageous due to manufacturing efficiencies, the drawback with such approaches is realized when one considers the properties of the outer soles. The sewing machine stitch wheel used to stitch the midsole, upper, and insole together interferes with the outsoles previously sewn onto the sole. As a result, a dilemma arises. Ideal outsole patches serve to 1) protect the foot 2) provide comfort, and 3) provide durability by protecting the seam attached to the midsole, outsole and footbed. In this way, the ideal outsole patches are thick and wide such that the perimeter of the outsoles is close to the seam. Still, as the outsole becomes thicker and is brought closer to the seam that joins the instep, midsole and insole, the seam becomes more difficult and over time impossible to stitch. Thus, prior art shoes are constructed with either (I) thin and wide or (ii) narrow and thick outsole patches. Furthermore, prior art shoes are limited in their ability to add cushioning inserts under the footbed because such cushioning inserts make the seam even less manageable and force more tapering and thinning of the outsole patches leading to greater instability and / or lower durability of the shoe and protection of the foot. Thus, in prior art shoes, the comfort and durability of the shoe is offset by the stability of the shoe. In this way the dilemma becomes apparent. If the outsole becomes thick and narrow, the lack of support due to the gap between the perimeter of the outer soles and the seam becomes noticeable and uncomfortable and the seam, upper and midsole are exposed to the ground. If the outsole is made thin and wide, the lack of support due to the gap between the perimeter of the outsole and the seam is not as noticeable. However, in such cases, the upper, midsole and seam are exposed to the ground, the outsole wears out more quickly, and the shoe provides limited protection and comfort.

Given the foregoing background, what is needed in the art are improved folding shoe designs and improved shoe manufacturing processes.

Description of the invention

The present disclosure addresses the foregoing and other shortcomings of the prior art by providing a shoe

ES 2 540 787 B2 improved folding, as well as a method of manufacturing said shoe. The shoes described are a kind of split sole women's shoe that allows the shoe to be folded and placed in a drawstring bag. The split sole is defined by a heel outsole patch and a toe outsole patch with a gap between the patches. Advantageously, the described shoes combine an upper and a midsole in a seam with a separately added insole. In this way, the insole is not sewn simultaneously at the seam that joins the midsole to the upper. This allows (i) the perimeter of the heel outsole patch and the toe outsole patch to be much closer to the seam that joins the midsole to the instep, and (i) the outsole patches to be thicker. , thereby providing better protection of the seam, midsole, and upper, greater support and comfort to the foot, a more rigid insole, and allows the insertion of a thicker and more solid padding.

In some embodiments, the outsole patches are stitched. In some embodiments, the outsole patches are both stitched and glued. To facilitate sewing on the patches, deep grooves are provided near the perimeter of each outsole patch. These deep grooves are used to form the seam between the patches and the midsole. The thread used to form this seam is better protected by the deep grooves thereby improving the durability of the shoe and preventing wear in the seam.

The described shoes have an improved spring constant over known shoes in the women's split sole class. In some embodiments, the total shoe elastic constant is between 0.157 kilograms-force / cm (0.40 kilograms-force / inch) and 0.275 kilograms-force / cm (0.70 kilograms-force / inch) or between 0.216 kilograms-force / cm (0.55 kilogram-force / inch) and 0.255 kilogram-force / cm (0.65 kilogram-force / inch). This improved spring force constant leads to greater support and allows for extended periods of wear.

In some embodiments, in addition to providing a foam inlay often found in women's shoes, the disclosed shoes allow for the insertion of a cushioning insert into the heel portion of the shoes to provide additional support and comfort. Furthermore, this heel portion has a greater thickness at the heel end of the shoe than at an intermediate position of the heel and toe ends of the shoes. Such tapered thickness provides additional comfort, support, and style.

While it is known to place an elastic constraint on the edge of the instep that receives a woman's foot, the described shoes provide an improved design by terminating the elastic constraint at the heel portion of the shoe. There, instead of using elastic limitation, an integrated cushioning (Achilles cushioning) is provided in order to provide greater comfort.

Brief description of the drawings

Figure 1 is a perspective view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 2 is a side view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 3 is a top view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 4 is a front view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 5 is a rear view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 6 is a cross-sectional side view of a shoe according to one aspect of the description in which the shoe is in an extended state.

Figure 6A is a cross-sectional view taken around region 6A-6A of Figure 6.

Figure 6B is a cross-sectional view taken around region 6B-6B of Figure 6.

Figure 7 is a perspective view of a shoe according to one aspect of the description showing a cushioning insert in which the shoe is in an extended state.

Figure 8 is a sectional perspective view of a shoe according to one aspect of the disclosure in which the shoe is in an extended state.

Figure 9 is a bottom view of a shoe according to one aspect of the description in which the shoe is in an extended state.

ES 2 540 787 B2

Figure 9A is a perspective view of the insert taken around line 9A-9A of Figure 9.

Figure 9B is a cross-sectional view of the insert of Figure 9B, taken around line 9B-9B of Figure 9.

Figure 10 is a compact box having a lid in which a pair of shoes of the immediate description can be stored in the folded state.

Figure 11 is a perspective of a shoe according to one aspect of the disclosure in which the shoe is in a folded state in which the shoe is folded about an axis such that a portion of an instep comprising a cavity of the toe box is hidden in a socket in the heel.

Figure 12 is a perspective view of a drawstring bag that can be used to store the shoes of the present disclosure.

Figure 13 is a perspective view of a tote bag that can be used to store shoes and other items according to the present disclosure.

Like reference numerals refer to corresponding parts throughout the various views of the drawings.

Detailed description

Figures 1 to 5 respectively provide perspective, side, top, front and rear views of a shoe according to the description. From the perspective and side views of Figures 1 and 2, and when worn, the shoe does not appear any different from a conventional stiff sole shoe. Still the shoe provides flexibility in design, foldability, and comfort without casually dressing the wearer's attire. In some embodiments, a cushioning insert absorbs shock to the foot when walking on hard surfaces. An elastic restraint 60 passes around the top of the instep 2 to grip the foot and form a snug fit on feet of various sizes and shapes. However, the elastic restraint 60 is designed not to encircle the entire foot, by stopping short at the rear where it would otherwise uncomfortably grip the Achilles tendon area. Instead, an Achilles cushion 56 is integrated into the upper crease that would otherwise surround the elastic restraint 60 to increase comfort. Furthermore, in some embodiments, the Achilles heel portion of the instep 2 is beveled to reduce its depth. By beveling this portion of the shoe, the seam that would normally protrude and come into contact with the foot is reduced, resulting in greater comfort.

The elastic restraint 60 is attached to the instep opening 2 so that when worn, the instep opening 2 will stretch to the size of the foot. In some embodiments, the elastic restraint 60 is sewn and glued to the vamp 2 to more securely fix the two materials. In some embodiments, the elastic restraint 60 is stitched but not glued to the instep 2. By sewing the elastic constraint without glue, the maximum amount that the elastic can be stretched is increased. This allows for a more comfortable fit on more foot sizes. In addition, by not sticking the elastic, the natural recovery rate of the elastic limitation is preserved, adding comfort and extending the useful life of the elastic.

Referring to Figure 6, a flexible insole 30 provides added comfort without compromising portability, and can be fixed or removable. Optionally, the flexible template 30 provides arch support. The shoe further comprises a foam inlay 44 that is glued to insole 30. In some embodiments, a flexible arch support provides added comfort without compromising portability. The flexible arch support does not restrict the folding of the shoe, and can be fixed or removable. In some embodiments, the midsole 8 is reinforced by securing flexible material within the midsole, under the insole 30 (eg, between the midsole 8 and the foam inlay 44). Reinforcing the midsole 8 in this way has several benefits. First, the flex points of the shoe are strengthened without compromising portability. Second, the portions of the midsole 8 that are most likely to suffer destructive friction from contact with the walking surface are strengthened to better resist stress. Third, the portion of the midsole 8 that comes into contact with the edge of the toe outsole patch is made more resistant to tearing. In some embodiments such reinforcement is in place of foam inlay 44. In some embodiments such reinforcement is in addition to foam inlay 44.

In some embodiments, a rigid insert is inserted between the middle of the foam inlay 44 and the midsole 8. This rigid insert extends the width of the midsole 8, and from the toe of the midsole 8 to no more than the midpoint 32 at the which footwear folds. By inserting the rigid insert in this way, more space is maintained when worn between the delicate portions of the shoe (eg, upper 2) and the walking surface. By increasing this space, durability is improved.

Continuing with reference to Figure 6, the shoe comprises three exclusively formed elements: a midsole 8, a heel outsole patch 24, and a toe outsole patch 26. In some embodiments, the midsole 8 is made of a flexible but durable material, such as high-quality leather. In some embodiments, the heel outsole patch 24 and toe outsole patch 26 are

ES 2 540 787 B2 constructed of non-slip material, for all types of weather. In typical embodiments, the heel outsole patch 24 and the toe outsole patch 26 are individually sewn to the midsole 8. The materials required for the necessary durability and safety of a full-time shoe are too stiff to provide the flexibility needed to be bent. Thus, in preferred embodiments, the heel sole patch 24 and the toe outsole patch 26 are distinct, and are individually sewn to the midsole 8 with a gap 32 between them so that the shoe is folded. The size and shape of the 24 heel outsole patch and 26 toe outsole patch are designed to optimally balance durability, comfort, and practicality, with compact size and minimal weight. The shape of the 24 heel outsole patch and 26 toe outsole patch maximize foot protection in a space efficient manner. In some embodiments, the contours of the heel outsole patch 24 and the toe outsole patch 26 are sloped to provide attractive additional height when worn, and to increase the clearance between the midsole 8 and the ground when worn. In such embodiments, the slope is designed so that when two shoes are stacked, the large one meets the small one in order to significantly reduce the combined thickness of the compressed pair for increased portability.

The upper 2 of the shoe is made from a high quality yet durable flexible material designed to withstand repeated folding in the center of the shoe, as well as long periods of storage in the folded position. Such materials reduce or eliminate cracks in the gasket surface, and damage from contact with the surfaces. Upper 2 is constructed and sewn in a way that wraps the top and sides of the foot. The specific ratio of the upper to the outsole also allows the soft upper 2 to mold to wide and narrow feet, molding to the unique shape of each wearer's foot, adding benefits of comfort and style. The proportion also reduces the volume of the shoes in the folded state for storage and portability. A rounded toe 6 cavity design and flexible wrap-around upper increases commercial appeal by reducing or eliminating the need for expensive mid-size and / or variable width inventory, while maintaining a durable and comfortable design. The design allows great flexibility for trendy elements throughout the upper such as distinctive colors, textures and ornamentation. When worn, the shoe appears no different from conventional fixed sole footwear, adding style and the ability to be worn with a more formal outfit.

Referring to Figure 13, a lightweight, durable, reusable, self-contained, collapsible tote bag with handles that can be folded and compressed and then stored in the compaction bag (Figure 12) adds utility to the packing system. folding shoe. In typical embodiments the bag is made of a bi-directional elastic material and is capable of self-folding into a shape that minimizes bulk (eg, a roughly spherical shape). In some embodiments, the bag stitching facilitates this stretching (eg, by zigzag stitching). In some embodiments, an elastic thread material is used in such a seam.

Advantageously, the handbag can be folded into a pocket of the handbag. In some embodiments, this pocket is on the inside of the handbag when the handbag is in the unfolded state. In some embodiments the pocket is made of an elastic material so that the handbag is compressed when in the folded state. When desired, the bag expands to carry an alternate pair of shoes with enough volume for additional items. In some embodiments this pocket is made of a bi-directional elastic material and is capable of self-folding into a shape that minimizes bulk (eg, an approximately spherical shape).

Referring to Figure 12, a bag made of elastic nylon, polyester, or similar material adds functionality by safely and cleanly storing collapsible footwear and related items. The bag compresses the shoe in its folded configuration to a minimum size when stored or transported. A rounded edge at the bottom of the bag also decreases bulk and increases compression. The bag is sized only slightly smaller than the shoe to minimize bulk. A drawstring around the opening of the bag also helps in compression, and seals dirty shoes from the contents of the purse or pocket. A pocket on the side of the bag allows for compressed storage of the tote bag and / or other items.

The described folding shoe design allows footwear to be worn in a normal way, consistent with conventional rigid sole products, and suitable for various surfaces, climates, fashions, etc. When storage or portability is desired, the shoes are manually folded at approximately their midpoint, thereby reducing their length in half. In their folded configuration, the shoes can be stacked and placed in the compaction bag for maximum compression and portability. Once placed in the bag, the pair requires approximately the spacing of a wallet, and can be carried in a purse or pocket.

Now that a summary of the inventive shoe has been described, specific features and various embodiments of the described shoes will now be described. With reference to Figure 7, a shoe according to the present description is illustrated. The shoe comprises an instep 2. The instep 2 forms an inner portion 62 for receiving a woman's foot. The inner portion includes a toe pocket 4 and a heel pocket 6.

With reference to Figure 9, the shoe further comprises a midsole 8. The midsole 8 has (i) a toe end 10, (ii) a heel end 12, (iii) an inner side 14 and (iv) a external 16. A perimeter of the

ES 2 540 787 B2 midsole 8 is sewn to the upper 2. The seam of the midsole 8 with the upper 2 thereby forms a lower part to the lower portion 62 which is joined by a first seam 22. An outer sole patch is sewn of heel 24 over a heel portion of the first face of the midsole 8. A toe outsole patch 26 is sewn onto a portion of the toe from the first face of the midsole 8.

In typical embodiments, the heel outsole patch 24 and the toe outsole patch 26 are sewn onto the midsole before the midsole 8 has been sewn to the upper 2.

Referring to Figure 6, there is a gap 32 between (i) the heel outsole patch 24 stitched onto the heel portion of the first face of the midsole 8 and (ii) the toe outsole patch 26 stitched. over the toe portion of the first face of the midsole 8. The gap 32 extends from the inner side 14 to the outer side 16 of the midsole 8 and occupies an intermediate position of the toe end 10 and the heel end 12 of the midsole 8 thereby allowing the entire shoe to fold around a axis 34 at gap 32 passing between inner side 14 and outer side 16. In some embodiments, the gap is between 1.27 cm (4/8 inch) and 1.905 cm (6/8 inch). In some embodiments, the spacing is about 1,587 cm (5/8 inch). In taking these measurements, an average distance between the heel outsole patch 24 and the toe outsole patch 26 can be taken through the region joined by the inner side 14 and the outer side 16. For example, at several different points in the region joined by inner side 14 to outer side 16, the distance between the edge of the heel outsole patch 24 and the edge of the toe outsole patch 26 can be measured and these Measurements can be averaged together to determine the distance between the heel outsole patch 24 and the toe outsole patch 26. In some embodiments the gap is simply a tear between the heel outsole patch 24 and the toe outsole patch 26.

Continuing to refer to Figure 6, the template 30 is glued to the bottom of the inner portion.

The shoe is configured to bend between (i) an extended state wherein the heel outsole patch 24 and the toe outsole patch 26 are coplanar or approximately coplanar (Figures 1 through 9) and (ii) a folded state. wherein the shoe is bent on axis 34 such that a portion of the instep 2 comprising the toe socket 4 is hidden in the heel socket 6 (Figure 11).

In some embodiments, the insole 30 is not sewn to the upper 2. Thus, in such embodiments, the first seam 22, illustrated in Figure 9, only joins the upper 2 and the midsole 8, not the insole 30. With reference to Figure 9, this provides a substantial advantage in that it allows a perimeter (edge) of the heel and toe outsole patches 24, 26 to be brought closer to the first seam 22 than in cases where the First seam ties 2 vamp, 8 midsole, and 30 footbed together, allowing for thicker heel and toe outsole patches, and more solid cushioning (thicker and stiffer) in the footbed. This distance is illustrated as distance 104 in Figure 9A. Accordingly, in embodiments where the first seam 22 only joins the upper 2 and the midsole 8, the rear corner edge 64 of the toe outsole patch 26 is within 0.635 cm (1/4 inch) of a portion. of the first seam 22. This proximity to the seam 22, along with the thickness of the outsole patches, advantageously serves to protect the first seam 22, as well as the midsole region 8 at the gap 32 from wear and tear. In some embodiments, an edge of the front corner 66 of the toe outsole patch 26 is within 0.635 cm (1/4 inch) of a portion of the first seam 22.

In typical embodiments, the distance 104 between the edge of the toe outsole patch 26 and the first seam 22 is uniform. In some embodiments in which this distance 104 is uniform, (i) the rear corner edge 64 and (ii) the front corner edge 66 of the toe outsole patch 26 are respectively within 1.27 cm ( 4/8 inch), 3/8 inch (0.952 cm), or 2/8 inch (0.635 cm) from a corresponding portion of the first seam 22.

In some embodiments, an edge of the rear corner 68 of the heel outsole patch 24 is within 0.476 cm (3/16 inch) of a portion of the first seam 22. In some embodiments, an edge of the front corner 70 of the heel outsole patch 24 is between 2/4 inch (1.27 cm) and 3/4 inch (1.905 cm) from a portion of the first seam 22. In some embodiments, the distance 104 between the edge of the heel outsole patch 24 and the first seam 22 is uniform. In some embodiments in which this distance 104 is uniform, (i) the rear corner edge 68 and (ii) the front corner edge 70 of the heel outsole patch 24 are respectively within 1.27 cm ( 4/8 inch), 3/8 inch (0.952 cm), or 2/8 inch (0.635 cm) from a corresponding portion of the first seam 22. In some embodiments, the distance 104 between the edge of the heel outsole patch 24 and the first seam 22 is not uniform. In some embodiments where this distance 104 is not uniform, the rear corner edge 68 of the heel outsole patch 26 is within 0.952 cm (3/8 inch), or 0.635 cm (2/8 inch). ) of a corresponding portion of the first seam 22.

Such close distances 104, combined with the thickness of the rubber and the stiffness of the cushioning allowed by the described mounting method, facilitate the protection of the midsole 8 and the upper 2, thus ensuring the durability of the shoe while at the same time a collapsible design is allowed that remains flexible and

ES 2 540 787 B2 comfortable.

Referring to Figure 9A, a unique and improved feature of the present shoes is the durability coefficient value. As used herein, the term durability coefficient is defined as the thickness 106 of an outsole patch divided by the distance 104 between the edge of the outsole patch and the first seam 22. In some embodiments, the distance 104 is 4mm and the thickness 106 is also 4mm, and thus the durability coefficient is unity. In some embodiments, the distance 104 is 4mm and the thickness 106 is 5mm, and thus the durability coefficient is 1.25. In some embodiments, the durability coefficient is between 0.8 and 1.5. In some embodiments, the durability coefficient is between 0.9 and 1.4. In some embodiments, the durability coefficient is between 1.0 and 1.3.

In some embodiments, advantageously, the heel outsole patch 24 and the toe outsole patch 26 are each at least 3/32 inch thick. In some embodiments, advantageously, the heel outsole patch 24 and the toe outsole patch 26 are each at least 4/32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 5/32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 6/32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 7/32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each at least 8/32 inch thick. Such thickness increases the elastic constant of the soles, leading to greater support for the foot and increased durability of the shoe. Referring to Figure 1, due to the thickness of the outsole patches, and their proximity to the edge, it is possible to see one side of the outsole patch at least at a 45 degree angle 100 from horizontal 102 when the shoe is worn. wears on a woman's foot when the woman is standing upright with respect to the horizontal. In some embodiments, it is possible to view one side of the outsole patch at least a 50 degree angle, at least a 55 degree angle, or at least a 60 degree angle 100 from the horizontal 102 when the shoe is worn at a woman's foot when the woman is standing upright with respect to the horizontal. This visibility of the outsole patches is described herein solely to establish a description of the dimensions and shapes of the shoes described.

In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each made from an elastomer. Exemplary elastomers that may be used include but are not limited to, for example, natural rubber, vulcanized natural rubber, a butadiene-styrene copolymer such as GR-S, neoprene, nitrile, butyl rubbers, polysulfide rubbers, ethylene rubbers. -propylene, polyurethane rubbers and silicone rubbers as described in Marks' Standard Handbook for Mechanical Engineers, 1987, Avallone and Baumeister, eds., McGraw-Hill, New York, pages 6-161 through 1-163, which is incorporated herein by reference. In some embodiments the midsole 8 is made of leather.

Referring to Figures 6, 6A and 6B, in some embodiments the shoe is characterized by a midsole 8. A heel outsole patch 24 and a toe outsole patch 26 are sewn onto a first face of the midsole 8. The midsole 8 comprises a second face having a heel portion 68 and a toe portion 70. In some embodiments, a cushion insert 46 is bonded to the heel portion 68 of a second face of the midsole 8. The insert 46 absorbs the impact of the foot when walking on hard surfaces. Insert 46 molds to the foot over time. A foam inlay 44 is glued to (i) the cushioning insert 46 and (ii) the toe portion 70 of the second face of the midsole 8. An insole 30 is then glued to the foam inlay 44. Damping insert 46 is characterized by a first end 76 and a second end 78. The first end 76 of the damping insert 46 is glued to a first part 72 of the bead portion 68 and the second end 78 of the damping insert 46 is glued to a second part 74 of the bead portion 68. The first part 72 of the heel portion 68 is closer to the toe portion 70 of the second face of the midsole 8 than the second portion 74 of the heel portion 68. In some embodiments, the first end 76 of the cushion insert 46 has a thickness that is less than the thickness of the second end 78 of the cushion insert 46. In some embodiments, the cushion insert 46 has a thickness that increases along the cushion insert 46 as a function of a distance away from the toe portion 70 of the second face of the midsole 8 such that a portion of the insert The cushioning that is closer to the toe portion 70 of the midsole is thinner than a portion of the cushioning insert 46 that is further away from the toe portion 70 of the midsole 8. In some embodiments, the maximum thickness of the cushion insert 46 is 3 millimeters or more, 4 millimeters or more, 5 millimeters or more, 6 millimeters or more, 7 millimeters or more, or 8 millimeters or more. This advantageously serves to improve the support provided by the shoe, particularly at the heel, provides a desired lift, and increases stiffness and hence durability.

In addition to providing a graduated thickness to improve foot support, cushioning insert 46 is made of a rigid material such as a rigid ethylene vinyl acetate material or similar cushioning material. In some embodiments, the cushion insert 46 has a Shore A hardness of between 45 and 70 or between 60 and 70. In some embodiments, the cushion insert 46 has a density of between 0.30 g / cm3 and 0.5 g / cm3, between

ES 2 540 787 B2

0.40 g / cm3 and 0.5 g / cm3, between 0.45 g / cm3 and 0.5 g / cm3, or between 0.50 g / cm3 and 0.70 g / cm3.

The thickness of the heel outsole patch 24 and the toe outsole patch 26 along with the materials used to make these patches, the proximity of these patches to the seam 22, and the ability to add the cushioning insert all contribute to an extremely improved elastic constant with respect to known folding shoes. In some embodiments, the total shoe spring constant taken along the heel portion 68 of the shoe (i.e., in the region of the heel outsole patch 24) is between 0.157 kilograms force / cm (0.40 kilograms- force / inch) and 0.275 kilogram-force / cm (0.70 kilogram-force / inch). In some embodiments, the total shoe spring constant taken along the heel portion 68 of the shoe is between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.255 kilogram-force / cm (0, 65 kilograms-force / inch), or between 0.216 kilograms-force / cm (0.55 kilograms-force / inch) and 0.255 kilograms-force / cm (0.65 kilograms-force / inch). In some embodiments, the total shoe spring constant taken along the heel portion 68 of the shoe is approximately 0.236 kilogram-force / cm (0.6 kilogram-force / inch). Referring to Figure 6, to arrive at the spring constant measurement, portions 68 and 70 are measured separately. For each region, with the shoe held at one end of a vertical position (that is, one end of portion 68 or 70 going the long way and with the shoe facing up as it would wear) is anchored and then the other The end of the portion 68 or 70 of the shoe being measured is forced a set distance (eg, 2.54 cm (1 inch)) and the force exerted by the end pushed down is then measured.

In some embodiments, the total shoe spring constant taken along the toe portion 70 of the shoe (i.e., in the region of the toe outsole patch 26) is between 0.157 kilogram-force / cm (0.40 kilograms-force / inch) and 0.275 kilograms-force / cm (0.70 kilograms-force / inch). In some embodiments, the total shoe spring constant taken along the toe portion 70 of the shoe is between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.255 kilogram-force / cm (0, 65 kilograms-force / inch) or between 0.216 kilograms-force / cm (0.55 kilograms-force / inch) and 0.255 kilograms-force / cm (0.65 kilograms-force / inch). In some embodiments, the total shoe spring constant taken along the toe portion 68 of the shoe is approximately 0.236 kilogram-force / cm (0.6 kilogram-force / inch).

Another advantageous feature of the shoes according to some embodiments of the present description are the deep grooves in the heel outsole patch 24 and the toe outsole patch 26 that facilitate sewing of the patches to the midsole 8 while at the same time will protect the seam. The deep grooves 48 are allowed by the advantageous design in which thick outsole patches are used which, at the same time, are close to the first seam 22 that joins the upper 2 to the midsole 8. The deep grooves 48 protect the seam that binds the outsole patches to the midsole 8 from contact with the ground, which would cause the seam to wear and thereby cause the outsole patches to become dislodged. These advantageous features are related. Only by sewing the upper 2 to the midsole 8 to form the first seam, instead of also sewing insole 30 to the midsole 8, it is possible both to minimize the distance 104 and to increase the thickness of the 24/26 outsole patches while still it is capable of sewing the midsole 8 to the upper 2 using conventional processes such as a sewing machine. Because the distance 104 is minimized, it is possible to make the outsole patches 24/26 thicker (ie, increase the distance 106) without destabilizing the foot support. Because the 24/26 outsole patches are thicker, it is possible to make the first groove 48 deeper thereby better protecting the seam within the groove. In addition, because the outsole patches are thicker, the shoe is firm and allows for use for longer periods of time and a wider spectrum of terrain (for example, on asphalt, concrete, dirt roads, etc.) . Referring to Figure 9, such an advantageous embodiment has a first groove 48 having a depth of at least 0.047 cm (3/64 inch) that is formed near a perimeter of the heel outsole patch 24. The heel outsole patch 24 is sewn onto the heel portion of the first face of the midsole 8 with a first thread occupying the first groove 48. In addition, a second groove 50 that has a depth of at least 0.047 cm ( 3/64 inch) is formed near a perimeter of the toe outsole patch 26. The toe outsole patch 26 is sewn onto the toe portion of the first face of the midsole 8 with a second thread occupying the second groove 50. In some embodiments, the first groove 48 is approximately 3/32 inch. In some embodiments, the second groove 50 is approximately 3/32 inch.

Referring to Figure 5, the instep 2 is formed as a single piece having a first end and a second end, where the first end and the second end are joined by a second seam 52 in the heel pocket. In some embodiments the upper 2 is made up of two or more pieces.

With reference to Figures 3 and 9, in typical embodiments, the upper 2 is formed as a single piece having (i) a first end (80), (ii) a second end (82), (iii) a first edge (84) (visible in Figure 9), and (iv) a second edge (86). In some embodiments, the upper 2 is formed of two or more pieces sewn together. Referring to Figure 3, in typical embodiments, the upper 2 is a single piece having ends 110A and 110B. Of course, the upper 2 can be formed of any number of pieces sewn together into a single piece having ends 110A and 110B. Regardless of whether the instep originates as one or multiple

In 2 540 787 B2 pieces, the ends 110A (first end) and 110B (second end) are joined by a second seam 52 in the heel pocket 6 to complete the instep 2. Referring to Figure 9, the first edge 84 of the instep 2 to the perimeter of the midsole 8 thereby forming the second seam 22 and the bottom of the inner portion of the shoe. Referring back to Figure 3, a first portion of the second edge 86 is characterized by an elastic constraint 60, where the portion of the second edge does not extend into the bead pocket 6. In some embodiments, the second portion of the second edge 86 is characterized by an Achilles cushioning 56 that provides an upper limit to the heel socket 6. Furthermore, referring to Figure 5, in some embodiments, a crescent piece 58 covers a lower portion of the second seam 52 while a strip portion 54 covers an upper portion of the second seam 52.

Referring to Figure 11, in some embodiments, the shoe is in a folded state. In this folded state, the shoes can be hidden in a compaction bag made of elastic nylon or similar material (Figure 12), which has a drawstring. This provides the advantageous transport of the shoes in a clean and compact state, while compressing them to a minimum size. In some embodiments, the bag includes a pocket for holding a handbag, where the handbag is configured to accommodate a pair of women's shoes, or other personal items and effects. This allows the possibility of carrying the shoes of the present disclosure in the bag while on the go, and switching to wearing the shoes of the present disclosure by storing the previously unwanted used shoes in the handbag after they have been worn. drawn from the pocket of the bag, and expanded from its collapsed form.

Advantageously, the shoes of the present disclosure are folded in a folded state so that they can be stored in a compact box having a lid. Such a compact box is illustrated in Figure 10.

In some embodiments, the edge of the outsole patches is beveled in two ways. First, the outer edge of the outsole patch is beveled on a steep incline for aesthetic and durability reasons. By retaining a steep bevel on the outer edge of the outsole patches, more space is maintained between the walking surface and the soft elements of the shoe, thereby increasing durability. Second, in some embodiments, the inside edge of one or more outsole patches is beveled. By beveling the outsole patch in this way, the pressure between the edge of the outsole patch and the softer midsole is reduced. This chamfer mitigates and smooths the edge of the outsole patch that is not attached to the midsole. By softening this edge, the durability and longevity of the shoe is improved.

As discussed above, prior art split sole footwear suffers from certain limitations. In some embodiments, the shortcomings of the prior art are overcome by providing shoes that achieve a maximum outsole ratio (OR), where OR is defined as:

DXTXW where,

D = mean depth of the second groove 50,

T = average thickness of the toe outsole patch 26,

W = maximum toe outsole patch width 26, and

M = midsole width 8 o'clock maximum width of toe outsole patch 26, where W is less than M, and D, T, W, and M are all given in the same unit of measurement (e.g., millimeters ).

Accordingly, in some embodiments, the shoes of the present disclosure have an OR outsole ratio. When this ratio is maximized, the toe outsole patch 26 is thick, the second groove 50 into which the toe outsole patch 26 is sewn is deep, and the toe outsole patch 26 is close to the edge. of footwear. In some embodiments, an acceptable outsole ratio requires a toe outsole patch 26 that is as narrow as possible while capable of accommodating a wide range of foot widths. The narrower the toe outsole patch 26, the more compact and portable the shoe is, and the better it will accommodate a narrow foot. A thicker 26 toe outsole patch is important for foot safety and comfort when walking on uneven surfaces.

Furthermore, as the width of the toe outsole patch 26 narrows, the depth of the second groove 50 for its seam becomes more important because that seam area will receive more contact with the walking surface. In this way, a deep groove 50 is necessary to protect the seam stitches. Also increasing in importance as the width of the toe outsole patch narrows

ES 2 540 787 B2 is the coverage of the midsole 8 by the toe outsole patch 26 and its proximity to the edge of the instep 2. The benefits of a toe outsole patch 26 that is closer to the edge of the shoe are have previously submitted. Given the present disclosure, it will be appreciated that these same principles apply to the heel outsole patch 24 and the first groove 48.

Table 1 below illustrates the preferred values ​​for the mean depth of the second groove 50 (D), the mean thickness of the toe outsole patch 26 (T), the maximum toe outsole patch width 26 (W) , and midsole width 8 at the point of maximum width of the toe outsole patch 26 (M) according to an embodiment of the present disclosure.

Table 1, preferred measurements for shoes according to one aspect of the description.

<td>Women's Shoe Size (American)</td><td> 5</td><td> 6</td><td> 7</td><td> 8</td><td> 9</td><td> 10</td><td> 11</td><td> 12</td>

<td>Depth of the second groove (D) in mm</td><td> 2,5</td><td> 2,5</td><td> 2,5</td><td> 2,5</td><td> 2,5</td><td> 2,5</td><td> 2,5</td><td> 2,5</td>

<td>Toe Outsole Patch Thickness (T) in mm</td><td> 4</td><td> 4</td><td> 4</td><td> 4</td><td> 4</td><td> 4</td><td> 4</td><td> 4</td>

<td>Maximum toe outsole patch width 26 (W) in mm</td><td> 66</td><td> 69</td><td> 72</td><td> 75</td><td> 78</td><td> 81</td><td> 84</td><td> 86</td>

<td>Midsole width 8 at the 26 toe outsole patch measurement point (M) in mm</td><td> 74</td><td> 77</td><td> 80</td><td> 83</td><td> 86</td><td> 89</td><td> 92</td><td> 94</td>

<td>D x T x W</td><td> 660</td><td> 690</td><td> 720</td><td> 750</td><td> 780</td><td> 810</td><td> 840</td><td> 860</td>

<td>D x T x W M</td><td> 8,92</td><td> 8,96</td><td> 9,00</td><td> 9,04</td><td> 9,07</td><td> 9,10</td><td> 9,13</td><td> 9,15</td>

In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.0 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.2 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.4 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.6 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 7.8 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.0 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.2 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.4 or greater. In some embodiments, the shoes of the present disclosure have an outsole ratio of 8.6 or higher. By achieving an outsole ratio of this magnitude, several benefits arise which increase the viability of split sole footwear.

Tables 2 and 3 below illustrate the preferred values ​​for the mean depth of the second groove 50 (D), the mean toe outsole patch thickness 26 (T), the maximum toe outsole patch width 26 (W ), and the midsole width 8 at the point of maximum width of the toe outsole patch 26 (M) according to embodiments of the present disclosure.

Table 2, preferred measurements for shoes based on one aspect of the description

<td>Women's Shoe Size (American)</td><td> 5</td><td> 6</td><td> 7</td><td> 8</td><td> 9</td><td> 10</td><td> 11</td><td> 12</td>

<td>Depth of the second groove (D) in mm</td><td> 2,5±,5</td><td> 2,5±,5</td><td> 2,5±,5</td><td> 2,5±,5</td><td> 2,5±,5</td><td> 2,5±.5</td><td> 2,5±,5</td><td> 2,5±,5</td>

<td>Toe Outsole Patch Thickness (T) in mm</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td><td> 4±,5</td>

<td>Maximum width of outsole patch of toe 26 (W) in mm</td><td> 66±2</td><td> 69±2</td><td> 72±2</td><td> 75±2</td><td> 78±2</td><td> 81±2</td><td> 84±2</td><td> 86±2</td>

<td>Midsole width 8 at the 26 toe outsole patch measurement point (M) in mm</td><td> 74±2</td><td> 77±2</td><td> 80±2</td><td> 83±2</td><td> 86±2</td><td> 89±2</td><td> 92±2</td><td> 94±2</td>

ES 2 540 787 B2

Table 3, preferred measurements for shoes based on one aspect of the description

<td>Women's Shoe Size (American)</td><td> 5</td><td> 6</td><td> 7</td><td> 8</td><td> 9</td><td> 10</td><td> 11</td><td> 12</td>

<td>Depth of the second groove (D) in mm</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td><td> 2,5±1</td>

<td>Toe Outsole Patch Thickness (T) in mm</td><td> 4±1</td><td> 4±1</td><td> 4±1</td><td> 4±1</td><td> 4±1</td><td> 4±1</td><td> 4±1</td><td> 4±1</td>

<td>Maximum toe outsole patch width 26 (W) in mm</td><td> 66±4</td><td> 69±4</td><td> 72±4</td><td> 75±4</td><td> 78±4</td><td> 81±4</td><td> 84±4</td><td> 86±4</td>

<td>Midsole width 8 at the 26 toe outsole patch measurement point (M) in mm</td><td> 74±4</td><td> 77±4</td><td> 80±4</td><td> 83±4</td><td> 86±4</td><td> 89±4</td><td> 92±4</td><td> 94±4</td>

In some embodiments, a shoe is provided that achieves a maximum outsole ratio (OR), where OR is defined as:

D 'x T' x W 'where,

D '= is the mean depth of the second groove 50 and is a value between 2.0 and 3.0 mm,

Τ '= is the average thickness of the toe outsole patch 26 and is a value of at least 3.0 mm,

W '= maximum toe outsole patch width 26, and is a value between 60 and 89 mm, and

M '= width of midsole 8 at the point of maximum width of the toe outsole patch 26, and is a value greater than W' which is between 70 mm and 93 mm, and where

OR 'is a value between 7.0 and 8.6.

In some embodiments, Τ 'has a value of at least 4.0mm, at least 5.0mm, at least 6.0mm, at least 7.0mm, at least 8.0mm, or at least 9, 0 mm.

A first benefit of shoes that meet the OR metric is improved comfort. Thicker outsole patches allow more cushioning between the foot and the walking surface and minimize the impact of hard objects. Wide outsole patches that are closer to the edge of the shoe cover the bottom of the foot more, preventing the foot from the uncomfortable feeling of putting pressure on the edge of the outsole or worse, hanging over the edge of the rubber.

A second benefit is improved foot protection. Thicker outsoles provide more of a barrier and thus more protection to the foot against hard or sharp objects. In addition, wider outsoles provide more protection and coverage of the foot.

A third benefit is improved durability. Outsoles close to the edge of the shoe protect the seam stitches, the outsole (24, 26), the midsole (8), and other delicate elements of the shoe. Thicker outsoles (24, 26) provide more outsole to wear off before delicate parts of the shoe (eg midsole 8) wear out due to contact with the ground. A deep groove (eg, first groove 48 and second groove 50) protects the outsole seam better so that it does not wear out as quickly.

A fourth benefit is that it allows for a more attractive style: the narrower shoe flexes to fit wider feet when needed. This is accomplished by a deep groove (for example, the first groove 48 and the second groove 50) that protects the seam from increased contact than the groove, and thus the seam in there, has with the ground in a narrower shoe. . This is further consumed by a thick outsole patch (e.g. heel outsole patch 24 and toe outsole patch 26) that is close to the edge that becomes increasingly important in already narrow shoes. that some feet are wider than the outsole. Here, the thickness of the outsole prevents wider feet from pushing the seam / midsole 8 / instep 2 below onto the ground.

A fifth benefit is that the shoe is more portable and compact because the patch area of ​​the shoe is minimized.

ES 2 540 787 B2 non-folding heel 24 outsole and toe outsole patch.

Exemplary achievements

The following are non-limiting exemplary embodiments of the present disclosure.

Embodiment A. A shoe comprising:

an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe socket and a heel socket;

a midsole, the midsole having (i) a toe cap, (ii) a heel cap, (iii) an inner side, and (iv) an outer side, wherein the perimeter of the midsole is sewn to the instep forming hence a lower part than the inner portion that is delimited by a first seam;

a heel outsole patch sewn onto a heel portion of the first face of the midsole;

a toe outsole patch sewn onto a toe portion of the first face of the midsole;

a template that is glued to the bottom of the inner portion;

wherein there is a gap between (i) the heel outsole patch sewn onto the heel portion of the first face of the midsole and (ii) the toe outsole patch sewn onto the toe portion of the first face from the midsole, the gap extends from the inner side to the outer side and occupies an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap that passes between the inner side and the external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is folded around the axis such that a portion of the upper that comprises the toe socket is hidden within the heel socket, and where (i) the insole is not sewn to the upper or midsole, and (ii) the heel outsole patch and the toe outsole patch are each made from an elastomer.

Embodiment B. A shoe comprising:

an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe socket and a heel socket;

a midsole, the midsole having (i) a toe cap, (ii) a heel cap, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole is sewn to the upper forming hence a lower part than the inner portion that is delimited by a first seam;

a heel outsole patch sewn onto a heel portion of the first face of the midsole;

a toe outsole patch sewn onto a toe portion of the first face of the midsole;

a template that is glued to the bottom of the inner portion;

wherein there is a gap between (i) the heel outsole patch sewn onto the heel portion of the first face of the midsole and (ii) the toe outsole patch sewn onto the toe portion of the first face from the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is folded around the axis such that a portion of the upper comprising the toe pocket is hidden within the heel pocket, and where (i) the insole is not sewn to the upper, or (ii) a region of the shoe defined by the heel outsole patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.157 kilogram-force / cm (0.40 kilogram-force / inch ) and 0.275 kilogram-force / cm (0.70 kilogram-force / inch).

Embodiment C. A shoe comprising:

ES 2 540 787 B2 an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe socket and a heel socket;

a midsole, the midsole having (i) a toe cap, (ii) a heel cap, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole is sewn to the upper forming hence a lower part than the inner portion that is delimited by a first seam;

a heel outsole patch sewn onto a heel portion of a first face of the midsole;

a toe outsole patch sewn onto a toe portion of the first face of the midsole;

a template that is glued to the bottom of the inner portion;

wherein there is a gap between (i) the heel outsole patch sewn onto the heel portion of the first face of the midsole and (ii) the toe outsole patch sewn onto the toe portion of the first face from the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is folded around the axis such that a portion of the upper comprising the toe pocket is hidden within the heel pocket, and where (i) the insole is not sewn to the upper, and (ii) a rear corner of the toe outsole patch is within 0.635 cm (1/4 inch) of a portion of the first seam.

Embodiment D. A shoe comprising:

an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe socket and a heel socket;

a midsole, the midsole having (i) a toe cap, (ii) a heel cap, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole is sewn to the upper forming hence a lower part than the inner portion that is delimited by a first seam;

a heel outsole patch sewn onto a heel portion of a first face of the midsole;

a toe outsole patch sewn onto a toe portion of the first face of the midsole;

a template that is glued to the bottom of the inner portion;

wherein there is a gap between (i) the heel outsole patch sewn onto the heel portion of the first face of the midsole and (ii) the toe outsole patch sewn onto the toe portion of the first face from the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is folded around the axis such that a portion of the upper comprising the toe pocket is hidden within the heel pocket, and where (i) the insole is not sewn to the upper, (ii) a first groove having a depth of at least 0.119 cm (3/64 inch) is formed near a perimeter of the heel outsole patch and wherein the heel outsole patch is sewn over the heel portion. heel of the first face of the midsole with a first thread occupying the first groove; and (iii) a second groove having a depth of at least 3/64 inch (0.119 cm) is formed near a perimeter of the toe outsole patch and where the toe outsole patch is sewn over the toe portion of the first face of the midsole with a second thread occupying the second groove.

Embodiment E. A shoe comprising:

an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe socket and a heel socket;

ES 2 540 787 B2 a midsole, the midsole having (i) a toe tip, (ii) a heel tip, (iii) an inner side, and (iv) an outer side, wherein a perimeter of the midsole it is sewn to the instep thereby forming a lower part to the inner portion which is delimited by a first seam;

a heel outsole patch sewn onto a heel portion of a first face of the midsole;

a toe outsole patch sewn onto a toe portion of the first face of the midsole;

a template that is glued to the bottom of the inner portion;

wherein there is a gap between (i) the heel outsole patch sewn onto the heel portion of the first face of the midsole and (ii) the toe outsole patch sewn onto the toe portion of the first face from the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is bent around the axis so that a portion of the instep comprising the toe socket is hidden within the heel socket, and wherein (i) a region of the shoe defined by the outsole heel patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.216 kilogram-force / cm (0.55 kilogram-force / inch), (ii) the toe outsole patch or the heel outsole patch has a durability coefficient between 0.8 and 1.5.

Embodiment F. A method of making a shoe, the method comprising:

(A) sewing a heel outsole patch onto a heel portion of a first face of a midsole;

(B) sewing a toe outsole patch onto a toe portion of the first face of the midsole;

(C) fixing a cushioning insert to the heel portion of a second face of the midsole, (D) the seam of an instep, the instep forming an inner portion for receiving a foot of a person, the inner portion including a toe box and a heel pocket, for the midsole, the midsole having (i) a toe tip, (ii) a heel tip, (iii) an inner side, and (iv) an outer side, wherein the seam (D) causes a perimeter of the midsole to be sewn to the instep thereby forming a lower part to the inner portion that is delimited by a first seam;

(E) gluing a template to the bottom of the inner portion;

wherein the seam (A) and seam (B) form a gap between (i) the outsole patch of the heel sewn onto the heel portion of the first face of the midsole and (ii) the outsole patch toe cap sewn onto the toe portion of the first face of the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is folded around the axis such that a portion of the upper that comprises the toe socket is hidden within the heel socket, and where (i) the insole is not sewn to the upper or midsole, and (ii) the heel outsole patch and the toe outsole patch are each made from an elastomer.

Embodiment G. A method of making a shoe, the method comprising:

(A) sewing a heel outsole patch onto a heel portion of a first face of a midsole;

(B) sewing a toe outsole patch onto a toe portion of the first face of the midsole;

(C) the seam of an instep, the instep that forms an inner portion for receiving a foot of a person, the inner portion that includes a toe socket and a heel socket, for the midsole, the midsole having (i) a toe end, (ii) a heel end, (iii) an inner side, and (iv) an outer side, wherein the

ES 2 540 787 B2 seam (D) causes a perimeter of the midsole to be sewn to the instep thereby forming a lower part to the inner portion which is delimited by a first seam;

(D) gluing a template to the bottom of the inner portion;

wherein the seam (A) and seam (B) form a gap between (i) the outsole patch of the heel sewn onto the heel portion of the first face of the midsole and (ii) the outsole patch toe cap sewn onto the toe portion of the first face of the midsole, the gap extending from the inner side to the outer side and occupying an intermediate position of the toe end and the heel end thereby allowing the entire shoe to bend around an axis in the gap passing between the side internal and external side;

wherein the shoe is configured to fold between (i) an extended state wherein the heel outsole patch and the toe outsole patch are coplanar or approximately coplanar and (ii) a folded state in which the shoe is bent around the axis so that a portion of the instep comprising the toe socket is hidden within the heel socket, and wherein (i) a region of the shoe defined by the heel outsole patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.216 kilogram-force / cm (0.55 kilogram-force / inch); and (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of between 0.8 and 1.5.

Embodiment H-1. Any of embodiments A, B, C, D, E, F and G, where the midsole is made of leather.

Embodiment H-2. Any of embodiments A, B, C, D, E, F and G, wherein the lower part of the inner portion further comprises a foam inlay and wherein the insole is glued to the foam inlay.

Embodiment H-3. Any of embodiments A, B, C, D, E, F, and G, wherein the inner portion further comprises a cushioning insert that is bonded to the heel portion of a second face of the midsole.

Embodiment H-4. The H-2 embodiment, wherein the midsole comprises a second face having a heel portion and a toe portion and wherein the inner portion further comprises a cushioning insert that is bonded to the heel portion of a second face of the midsole, and the foam inlay is glued to (i) the cushioning insert and (ii) the toe portion of the second face of the midsole.

Embodiment H-5. The H-3 embodiment, wherein the cushion insert is characterized by a first end and a second end, wherein the first end of the cushion insert is glued to a first part of the heel portion and the second end of the insert cushioning is glued to a second part of the heel portion, wherein the first part of the heel portion is closer to the toe portion of the second face of the midsole than the second part of the heel portion, and the first end of the cushioning insert has a thickness that is less than the second end of the cushion insert.

Embodiment H-6. The H-3 embodiment, wherein the cushioning insert has a thickness that increases along the insert as a function of a distance away from the toe portion of the second face of the midsole such that a portion of the insert is cushioning that is closer to the toe portion of the midsole is thinner than a portion of the cushioning insert that is further away from the toe portion of the midsole.

Embodiment H-7. The H-3 embodiment, wherein the damping insert comprises an ethylene vinyl acetate or polyurethane type material.

Embodiment H-8. The H-3 embodiment, where the damping insert has a Shore A hardness of between 45 and 70 or between 60 and 70.

Embodiment H-9. The H-3 embodiment, wherein the cushion insert has a density of between 0.30 g / cm3 and 0.7 g / cm3.

ES 2 540 787 B2

Embodiment H-10. The H-3 embodiment, wherein the cushion insert has a density between 0.40 g / cm3 and 0.7 g / cm3.

Embodiment H-11. Any of embodiments A, B, C, D, E, F, and G, wherein a first groove having a depth of at least 3/64 inch (0.119 cm) is formed near a perimeter of the outsole patch heel and wherein the heel outsole patch is sewn onto the heel portion of the first face of the midsole with a first thread occupying the first groove; and a second groove having a depth of at least 0.119 cm (3/64 inch) is formed near a perimeter of the toe outsole patch and wherein the toe outsole patch is sewn over the toe portion. toe of the first face of the midsole with a second thread occupying the second groove.

Embodiment H-12. Any of embodiments A, B, C, D, E, F, and G, wherein the instep is formed as a single piece having a first end and a second end, wherein the first end and the second end are joined by a second seam in the heel pocket.

Embodiment H-13. Any of embodiments A, B, C, D, E, F, and G, wherein the instep is formed as a single piece having (i) a first end, (ii) a second end, (iii) a first edge , and (iv) a second edge, the first end and the second end are joined by a second seam in the heel cavity, the first edge is sewn to the perimeter of the midsole thereby forming the bottom of the inner portion, a first portion of the second edge is characterized by an elastic constraint, wherein the portion of the second edge does not extend into the bead pocket.

Embodiment H-14. Any of embodiments A, B, C, D, E, F, and G, wherein a second portion of the second edge is characterized by Achilles cushioning that provides an upper limit to the heel socket.

Embodiment H-15. Any of embodiments A, B, C, D, E, F and G, wherein the upper is formed as a single piece having a first end and a second end, the first end and the second end are joined by a second end. seam in the heel socket, and a crescent piece covers a lower portion of the second seam.

Embodiment H-16. Any of embodiments A, B, C, D, E, F and G, wherein the shoe is in a folded state and is hidden in a bag having a string.

Embodiment H-17. The H-16 embodiment, wherein the bag includes a pocket for holding a handbag, wherein the handbag is configured to accommodate a pair of shoes.

Embodiment H-18. Any of embodiments A, B, C, D, E, F and G, wherein the shoe is in a folded state and is hidden in a compact box having a lid.

Embodiment H-19. Any of embodiments A, B, C, D, E, F, and G, wherein a rear corner of the toe outsole patch is within 1/4 inch of a portion of the first seam.

Embodiment H-20. Any of embodiments A, B, C, D, E, F and G, wherein the rear corner of the toe outsole patch is within 3/16 inch of a portion of the first seam.

Embodiment H-21. Any of embodiments A, B, C, D, E, F, and G, wherein a front corner of the toe outsole patch is within 1/4 inch of a portion of the first seam.

Embodiment H-22. Any of embodiments A, B, C, D, E, F and G, wherein a rear corner of the heel outsole patch is within 3/16 inch of a portion of the first seam.

Embodiment H-23. Any of embodiments A, B, C, D, E, F, and G, wherein a rear corner of the heel outsole patch is within 1/4 inch of a portion of the first seam.

Embodiment H-24. Any of embodiments A, B, C, D, E, F and G, wherein the toe outsole patch or the heel outsole patch has a durability coefficient of between 0.8 and 1.5.

Embodiment H-25. Any of embodiments A, B, C, D, E, F and G, wherein the toe outsole patch or the heel outsole patch has a durability coefficient of between 1.0 and 1.3.

ES 2 540 787 B2

Embodiment H-26. Any of embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch are each at least 3/32 inch thick .

Embodiment H-27. Any of embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch are each about 5/32 inch in diameter. thickness.

Embodiment H-28. Any of embodiments A, B, C, D, E, F, and G, wherein the spacing is between 1.27 cm (4/8 inch) and 1.905 cm (6/8 inch).

Embodiment H-29. Any of embodiments A, B, C, D, E, F, and G, wherein the spacing is about 5/8 inch (1,587 cm).

Embodiment H-30. Any of embodiments A, B, C, D, E, F, and G, wherein one side of the heel outsole patch is visible at least at a 45 degree angle from the horizontal when the shoe is worn on the foot of a person who is standing horizontally.

Embodiment H-31. Any of embodiments A, B, C, D, E, F, and G, wherein one side of the toe outsole patch is visible at least at a 45 degree angle from horizontal when the shoe is worn on the foot of a person who is standing horizontally.

Embodiment H-32. Any of embodiments A, B, C, D, E, F, and G, wherein a region of the shoe defined by the outsole heel patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.157 kilogram-force / cm (0.40 kilogram-force / inch) and 0.275 kilogram-force / cm (0.70 kilogram-force / inch).

Embodiment H-33. Any of embodiments A, B, C, D, E, F, and G, wherein a region of the shoe defined by the outsole heel patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.216 kilogram-force / cm (0.55 kilogram-force / inch).

Embodiment H-34. Any of embodiments A, B, C, D, E, F, and G, wherein a region of the shoe defined by the toe outsole patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.157 kilogram-force / cm (0.40 kilogram-force / inch) and 0.275 kilogram-force / cm (0.70 kilogram-force / inch).

Embodiment H-35. Any of embodiments A, B, C, D, E, F, and G, wherein a region of the shoe defined by the toe outsole patch and comprising a corresponding portion of the midsole and the insole has an elastic constant of between 0.177 kilogram-force / cm (0.45 kilogram-force / inch) and 0.216 kilogram-force / cm (0.55 kilogram-force / inch).

<td colspan="2">Embodiment H-36. women.</td><td>Any</td><td>from</td><td>the</td><td colspan="2">embodiments A,</td><td>B,</td><td>C,</td><td>D,</td><td>AND,</td><td>F</td><td colspan="2">yg,</td><td>on</td><td colspan="2">where he</td><td colspan="2">shoe is</td><td>a</td><td>shoe</td><td>in order to</td>

<td>Realization</td><td>H-37.</td><td>Any</td><td>from</td><td>the</td><td>achievements</td><td>TO,</td><td>B,</td><td>C,</td><td>D,</td><td>AND,</td><td>F</td><td>Y</td><td>G,</td><td>on</td><td>where</td><td>the</td><td>shoe</td><td>it is</td><td>a</td><td>shoe</td><td>in order to</td>

<td>mens.</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td>

<td>Realization</td><td>H-38.</td><td>Any</td><td>from</td><td>the</td><td>achievements</td><td>TO,</td><td>B,</td><td>C,</td><td>D,</td><td>AND,</td><td>F</td><td>Y</td><td>G,</td><td>on</td><td>where</td><td>the</td><td>shoe</td><td>it is</td><td>a</td><td>shoe</td><td>in order to</td>

<td colspan="2">men women,</td><td>or children.</td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td><td></td>

Cited References and Alternative Realizations

All references cited herein are incorporated by reference in their entirety and for all purposes to the same extent as if each individual publication or patent or patent application is specifically and individually indicated to be incorporated by reference in its entirety for all. purposes.

Many modifications and variations can be made of this invention without departing from its spirit and scope, as will be apparent to those skilled in the art. The specific embodiments described herein are offered by way of example only. The embodiments were chosen and described in order to better explain the principles of the invention and its practical applications, thereby allowing others skilled in the art to better utilize the invention and various embodiments with various modifications as appropriate for the particular use contemplated.

This description extends to a variety of shoe styles (in addition to the basic ballet shoe / flat depicted in the diagrams). For example: sandals, flip flops, athletic and active shoes can be made with a similar construction for flexible compression and compact storage and are fully encompassed within the scope of the present invention. Furthermore, although embodiments that are designed for women have been described, it will be appreciated that such shoes can be designed for men, boys, or any combination of women, men, and children. All of such alternative designs are completely within the

ES 2 540 787 B2 scope of the present description.

The described base shoe and compaction bag design offers significant potential for surface differentiation through ornamentation, materials, and colors, increasing their commercial appeal. Alternative construction methods may include gluing the outsoles to the midsole without any seams. 5 The invention is to be limited only by the terms of the appended claims, together with the full scope of equivalents to which such claims are entitled.