Split-sole footwear

Abstract

To provide improved foldable shoe designs and improved shoe manufacturing processes.SOLUTION: A shoe comprising an upper forming an interior portion for a foot, the interior portion including toe and heel cavities, is provided. The shoe further comprises a midsole having toe and heel ends and inner and outer sides. The midsole is stitched to the upper thereby forming a bottom to the interior portion. Heel and toe outsole patches are respectively stitched onto the midsole. An insole is affixed to the bottom of the interior portion. A spacing between the heel and toe outsole patches extends from the inner to the outer side and occupies a position intermediate between the toe and heel ends, thereby permitting the shoe to fold about an axis running through the spacing. The shoe folds between an extended state in which the shoe is worn, and a folded state in which a portion of the upper comprising the toe cavity is tucked into the heel cavity.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to U.S. Patent Application No. 13 / 207,397, filed August 10, 2011, entitled "Split-Sole Footwear."

[0002] FIELD OF THE DISCLOSURE The present disclosure relates to footwear, and more particularly to split-sole shoes. [Background technology]

[0003] Traditional footwear has structural limitations that force wearers to make difficult choices between style and comfort. As a result, many people are forced to endure significant foot pain or choose less attractive shoes or styles that are inappropriate for the occasion. To solve this problem, some women keep extra footwear in their cars or carry it in large bags. However, carrying extra traditional shoes is less than ideal due to size and volume limitations for portability. Lightweight, rollable, or foldable shoes are available for greater portability. However, such products do not offer the support, durability, comfort, or style desired in non-foldable shoes.

[0004] Furthermore, prior art foldable shoes have outsoles that do not adequately protect the shoe's midsole and upper, resulting in premature shoe wear (including tears or damage to the shoe). Furthermore, such shoes are generally weak, meaning they do not adequately support or protect the foot. For example, many foldable shoes have an overall spring constant of between 0.14 kilogram-force per inch and 0.34 kilogram-force per inch, depending on the brand and model. Such shoes offer little or no resistance, protection, and support, and are therefore not suitable for repeated or prolonged use, especially outdoors or on rough terrain (e.g., dirty sidewalks, stones, etc.). Furthermore, such shoes are not durable enough to last the lifespan of a typical shoe, even with only moderate use. Thus, while some footwear designs have attempted to bridge the gap between adequate shoe lifespan and portability, a practical solution has yet to be found.

[0005] In prior art shoe manufacturing processes, outsoles are sewn to midsoles. These outsoles are located at the bottom of the shoe, protecting the midsole and upper from wear and tear while also providing support and rigidity to the entire shoe. After the outsole is sewn, the midsole is sewn to the upper and insole, thereby forming a single seam. This single seam traverses the perimeter of the shoe, essentially delineating the shoe upper from the midsole. While such a process is advantageous for manufacturing efficiency, the characteristics of the outsole reveal its drawbacks. The sewing wheel of the sewing machine used to sew the midsole, upper, and insole together interferes with the outsole, which is pre-sewn to the midsole. This results in a dilemma. An ideal outsole patch functions to 1) protect the foot, 2) provide comfort, and 3) provide durability by protecting the seams that secure the midsole, outsole, and insole. Therefore, an ideal outsole patch would be thick and wide so that the perimeter of the outsole is close to the seam. However, as the outsole becomes thicker and closer to the seam that secures the upper, midsole, and insole, the seam becomes more difficult and eventually impossible to sew together. Therefore, prior art shoes are constructed using either (i) thin and wide outsole patches or (ii) narrow and thick outsole patches. Furthermore, prior art shoes are limited in their ability to add cushioning inserts below the insole because the insertion of such cushioning inserts makes the seam more difficult to manage and forces the outsole patch to be narrower and thinner, thereby increasing the shoe's instability and / or reducing the shoe's durability and foot protection. Therefore, prior art shoes trade off comfort and durability against shoe stability. The dilemma is clear.In the case of a thickened and narrowed outsole, the lack of support due to the gap between the perimeter of the outsole and the seam is more pronounced, resulting in poor comfort and leaving the seam, upper, and midsole exposed to the ground. In the case of a thickened and narrowed outsole, the lack of support due to the gap between the perimeter of the outsole and the seam is less pronounced. However, in such cases, the upper, midsole, and seam are exposed to the ground, the outsole wears more quickly, and the protection and comfort provided by the shoe is limited. Summary of the Invention [Problem to be solved by the invention]

[0006] In view of the above background, there is a need in the art for improved foldable shoe designs and improved shoe manufacturing processes. [Means for solving the problem]

[0007] The present disclosure addresses the aforementioned and other shortcomings of the prior art by providing an improved foldable shoe. The shoe of the present disclosure is a women's split-sole shoe that allows the shoe to be folded and stored in a drawstring pouch. The split sole is defined by a heel outsole patch and a toe outsole patch (with a gap between the two patches). In the shoe of the present disclosure, advantageously, the upper and midsole are joined at a seam, and the insole is added separately. Thus, the insole is not simultaneously sewn to the seam joining the midsole and upper. This allows (i) the perimeters of the heel outsole patch and the toe outsole patch to be closer to the seam joining the midsole to the upper, and (ii) the outsole patch to be thicker, thereby better protecting the seam, midsole, and upper, providing better support and comfort for the foot, and allowing for a firmer insole and the insertion of a thicker, more substantial cushion.

[0008] In some embodiments, the outsole patches are sewn. In some embodiments, the outsole patches are both sewn and glued. To aid in sewing the patches, deep grooves are provided near the perimeter of each outsole patch. These deep grooves are used to form a seam between the patch and the midsole. The thread used to form this seam is better protected by the deeper grooves, thereby improving the durability of the shoe and preventing abrasion on the seam.

[0009] The shoes of the present disclosure have an improved spring rate compared to known women's split-sole shoes. In some embodiments, the overall shoe spring rate is between 0.40 kilogram-force / inch and 0.70 kilogram-force / inch, or between 0.55 kilogram-force / inch and 0.65 kilogram-force / inch. This improved spring rate allows for increased support and extended wear.

[0010] In some embodiments, in addition to providing a foam inlay, which is often used in women's shoes, the shoe of the present disclosure includes a cushioning insert in the heel portion of the shoe, which can provide support and comfort. Furthermore, the heel portion is thicker at the heel end of the shoe than it is halfway between the heel end and the toe end of the shoe. This tapered thickness provides increased comfort, support, and style.

[0011] While it is known to place an elastic restraint at the edge of the upper that receives the female foot, the shoe of the present disclosure offers an improved design by terminating the elastic restraint at the heel portion of the shoe. Rather than using an elastic restraint, an embedded cushion (Achilles cushion) is provided for improved comfort.

[0012] Like reference numerals refer to corresponding parts throughout the several views. [Brief explanation of the drawings]

[0013] [Figure 1] 1 illustrates a perspective view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 2] FIG. 1 is a side view of a shoe according to one aspect of the present disclosure, with the shoe in an extension state. [Figure 3] FIG. 1 is a top view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 4] FIG. 1 is a front view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 5] FIG. 1 is a rear view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 6] FIG. 1 is a cross-sectional side view of a shoe according to one aspect of the present disclosure, with the shoe in an extension state. [Figure 6A] FIG. 6A is a cross-sectional view of the area around region 6A-6A of FIG. [Figure 6B] FIG. 6B is a cross-sectional view of the area around region 6B-6B of FIG. [Figure 7] FIG. 1 is a perspective view of a shoe according to one aspect of the present disclosure showing the cushion insert with the shoe in an extended position. [Figure 8] FIG. 1 is a cutaway perspective view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 9] FIG. 1 is a bottom view of a shoe according to one aspect of the present disclosure, with the shoe in an extended position. [Figure 9A] 9A is an inset perspective view around line 9A-9A of FIG. 9. [Figure 9B] 9B is an inset cross-sectional view of FIG. 9B around line 9B-9B of FIG. 9. [Figure 10] FIG. 1 illustrates a compact box with a lid in which a pair of shoes of the present disclosure can be stored in a folded state. [Figure 11] FIG. 1 is a perspective view of a shoe according to one embodiment of the present disclosure in a folded state (a state in which the shoe is folded around an axis so that the portion of the upper including the toe cavity is pushed into the heel cavity). [Figure 12] FIG. 1 is a perspective view of a pouch with a drawstring that may be used to store shoes of the present disclosure. [Figure 13]FIG. 1 is a perspective view of a tote bag that may be used to store shoes and other items according to the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0014] 1-5 provide perspective, side, top, front, and rear views, respectively, of a shoe according to the present disclosure. From the perspective and side views of FIGS. 1 and 2, a shoe according to the present disclosure appears no different from a conventional hard-soled shoe when worn. However, the shoe according to the present disclosure offers flexibility in design, foldability, and comfort without simplifying the wearer's dressing routine. In some embodiments, a cushion insert absorbs shocks applied to the foot resulting from walking on hard surfaces. An elastic limiting portion 60 is provided around the top of the upper 2 to grip the foot and provide a snug fit for various foot sizes and shapes. However, the elastic limiting portion 60 is designed not to encircle the entire foot by terminating short of the rear (where, if the elastic limiting portion 60 were provided, it would grip the Achilles tendon area, causing discomfort to the wearer). Instead, Achilles cushion 56 is recessed into the upper fold that would normally surround elastic limiter 60, thereby improving comfort. Additionally, in some embodiments, the Achilles heel portion of upper 2 is trimmed to reduce its depth. By trimming this portion of the shoe, the seam that would normally protrude and come into contact with the foot is reduced, resulting in improved comfort.

[0015] The elastic limiting portion 60 is secured to the opening of the upper 2 so that the opening stretches to the size of the foot when worn. In some embodiments, the elastic limiting portion 60 is sewn and glued to the upper 2 to most securely secure these two materials. In some embodiments, the elastic limiting portion 60 is sewn but not glued to the upper 2. Sewing the elastic limiting portion without gluing it increases the maximum amount the elastic portion can stretch, allowing for a comfortable fit for a wider range of foot sizes. Additionally, not gluing the elastic portion preserves the natural recovery rate of the elastic limiting portion, improving comfort and extending the lifespan of the elastic portion.

[0016] Referring to FIG. 6 , flexible insole 30 provides enhanced comfort without sacrificing portability and can be fixed or removable. Optionally, flexible insole 30 provides arch support. The shoe further includes a foam inlay 44 secured to insole 30 with an adhesive. In some embodiments, the flexible arch support enhances comfort without sacrificing portability. The flexible arch support does not restrict the shoe's collapsibility and can be fixed or removable. In some embodiments, midsole 8 is reinforced by securing a flexible material inside the midsole and below insole 30 (e.g., between midsole 8 and foam inlay 44). Reinforcing midsole 8 in this manner has several advantages. First, the flex points of the footwear are strengthened without sacrificing portability. Second, the portions of midsole 8 most likely to experience destructive friction resulting from contact with the walking surface are strengthened to better withstand such stresses. Third, the portion of the midsole 8 in contact with the edge of the toe outsole patch is more resistant to tearing. In some embodiments, such reinforcement is provided as an alternative to the foam inlay 44. In some embodiments, such reinforcement is provided in addition to the foam inlay 44.

[0017] In some embodiments, a hard insert is inserted between the foam inlay 44 and the midsole 8. This hard insert extends the width of the midsole 8 from the toe of the midsole 8 to the midpoint 32 where the footwear folds. By inserting the hard insert in this manner, greater spacing is maintained between sensitive portions of the footwear (e.g., upper 2) and the walking surface during wear. Increasing this spacing improves durability.

[0018] Continuing to refer to FIG. 6 , the shoe comprises three uniquely shaped components: midsole 8, heel outsole patch 24, and toe outsole patch 26. In some embodiments, midsole 8 is made from a flexible yet durable material (e.g., premium leather). In some embodiments, heel outsole patch 24 and toe outsole patch 26 are constructed from an all-weather, non-slip material. In a typical embodiment, heel outsole patch 24 and toe outsole patch 26 are separately sewn to midsole 8. Materials required to meet the durability and safety needs of a shoe intended for everyday wear are too stiff to provide the flexibility necessary for folding. Therefore, in a preferred embodiment, heel outsole patch 24 and toe outsole patch 26 are separate and are separately sewn to midsole 8 with a gap 32 between heel outsole patch 24 and toe outsole patch 26 to allow the shoe to be folded. The dimensions and shape of the heel outsole patch 24 and the toe outsole patch 26 are designed to optimally balance durability, comfort, and practicality with compact dimensions and minimal weight. The shapes of the heel outsole patch 24 and the toe outsole patch 26 maximize protection for the foot in a spatially efficient manner. In some embodiments, the contours of the heel outsole patch 24 and the toe outsole patch 26 are sloped to attractively provide 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 high points and low points match, significantly shortening the combined thickness of the compressed pair and thereby improving portability.

[0019] The shoe upper 2 is made of a high-quality, flexible yet durable material designed to withstand repeated folding at the center of the shoe and long-term storage in the folded position. Such material reduces or eliminates cracking at the interface surfaces and damage caused by contact with surfaces. The upper 2 is constructed and sewn to wrap around the top and sides of the foot. The specific proportions of the upper and outsole allow the soft upper 2 to mold to wide and narrow feet, thereby conforming to the specific shape of each wearer's foot and providing additional comfort and style benefits. Such proportions also reduce the volume of the shoe when folded for storage and portability. The rounded toe cavity 6 and wraparound upper design increase commercial appeal by reducing or eliminating the need for costly half-size and / or variable-width inventory while maintaining a durable and comfortable design. This design allows for great flexibility in terms of fashion elements through the upper's distinctive color, feel, decoration, etc. When worn, the shoe has an appearance no different from traditional fixed-soled footwear, enhancing style and allowing it to be worn with more formal attire.

[0020] Referring to FIG. 13, a lightweight, durable, reusable, self-retracting tote bag with handles that can be folded and compressed into a compact storage pouch (FIG. 12) further enhances the utility of the foldable shoe system. In a typical embodiment, the pouch is made from a two-way stretchable material and is self-foldable into a minimally voluminous shape (e.g., a generally spherical shape). In some embodiments, the pouch's stitching assists this stretching (e.g., by using zigzag stitching). In some embodiments, a stretchable thread material is used for such stitching.

[0021] Advantageously, the tote bag can be folded into a pocket of the tote bag. In some embodiments, the pocket is inside the tote bag when the tote bag is in an unfolded state. In some embodiments, the pocket is made of a resilient material so that it compresses when the tote bag is in a folded state. If desired, the tote bag expands to carry an additional pair of shoes while still providing sufficient volume for additional items. In some embodiments, the pocket is made of a bi-directionally stretchable material and is self-foldable into a shape that minimizes volume (e.g., a generally spherical shape).

[0022] Referring to FIG. 12, a pouch made from stretch nylon, polyester, or similar material enhances functionality by safely and cleanly storing foldable footwear and related items. The pouch compresses the footwear in a folded configuration to minimize size during storage or transport. Rounded edges at the bottom of the pouch reduce volume and increase compression. The pouch has dimensions that are just slightly smaller than the footwear to minimize volume. A drawstring around the pouch opening further aids compression, shielding dirty shoes from wallet or pocket contents. A pocket located on one side of the pouch allows for compressed storage of a tote bag and / or other items.

[0023] The foldable shoe design of the present disclosure allows footwear to be worn in a normal manner, suitable for a variety of surfaces, weather conditions, fashions, etc., similar to traditional hard-soled products. When storage or portability is desired, the shoe is manually folded at approximately its midpoint, thereby reducing the shoe's length in half. In the folded configuration, the shoes can be bundled and placed within a compact storage pouch to maximize compression and portability. When stored within the pouch, a pair of shoes requires approximately the size of a wallet and can be carried in a purse or pocket.

[0024] Having now disclosed an overview of the shoe of the present disclosure, specific features and various embodiments of the shoe of the present disclosure will now be described. Referring to Figure 7, a shoe of the present disclosure is shown. The shoe comprises an upper 2. The upper 2 defines a medial portion 62 for receiving a female foot. The medial portion comprises a toe cavity 4 and a heel cavity 6.

[0025] Referring to Figure 9, the shoe further includes a midsole 8. The midsole 8 includes (i) a toe portion 10, (ii) a heel end 12, (iii) a medial side portion 14, and (iv) a lateral side portion 16. The perimeter of the midsole 8 is sewn to the upper 2. When the midsole 8 is sewn to the upper 2, it forms a bottom for the medial portion 62 surrounded by the first seam 22. A heel outsole patch 24 is sewn to the heel portion of the first surface of the midsole 8. A toe outsole patch 26 is sewn to the toe portion of the first surface of the midsole 8.

[0026] In a typical embodiment, heel outsole patch 24 and toe outsole patch 26 are sewn to the midsole 8 before the midsole 8 is sewn to the upper 2 .

[0027] Referring to FIG. 6 , a gap 32 exists between (i) a heel outsole patch 24 sewn to the heel portion of the first surface of the midsole 8 and (ii) a toe outsole patch 26 sewn to the toe portion of the first surface of the midsole 8. The gap 32 extends from the medial side 14 to the lateral side 16 of the midsole 8 and occupies a position midway between the toe end 10 and the heel end 12 of the midsole 8, thereby allowing the entire shoe to be folded about an axis 34 at the gap 32 extending between the medial side 14 and the lateral side 16. In some embodiments, the gap is between 4 / 8 inch and 6 / 8 inch. In some embodiments, the gap is approximately 5 / 8 inch. In determining these measurements, it is helpful to determine the “average” distance between the heel outsole patch 24 and the toe outsole patch 26 in the area bounded by the medial side 14 and the lateral side 16. For example, the distance between the edge of heel outsole patch 24 and the edge of toe outsole patch 26 can be measured at several different points in the area bounded by medial side 14 and lateral side 16, and these measurements can be averaged to determine the distance between heel outsole patch 24 and toe outsole patch 26. In some embodiments, these spacings are simply the discontinuities between heel outsole patch 24 and toe outsole patch 26.

[0028] Continuing with reference to FIG. 6, the insole 30 is secured to the bottom of the medial portion by adhesive.

[0029] The shoe is configured to fold between (i) an extended state (FIGS. 1-9) in which the heel outsole patch 24 and the toe outsole patch 26 are coplanar or nearly coplanar, and (ii) a folded state (FIG. 11) in which the shoe is folded about axis 34 so that the portion of upper 2 including toe cavity 4 is forced into heel cavity 6.

[0030] In some embodiments, the insole 30 is not stitched to the upper 2. Thus, in such embodiments, the first seam 22 illustrated in FIG. 9 joins the upper 2 and the midsole 8 but not the insole 30. Referring to FIG. 9, this provides a substantial advantage because it allows the perimeters (edges) of the heel outsole patch 24 and the toe outsole patch 26 to be closer to the first seam 22 than would be possible if the first seam integrated the upper 2, midsole 8, and insole 30, allowing for thicker heel outsole patch and firmer (e.g., thicker and stiffer) cushioning in the insole. This distance is illustrated as distance 104 in FIG. 9A. Thus, in embodiments in which the first seam 22 joins only the upper 2 and the midsole 8, the edge of the rear corner 64 of the toe outsole patch 26 is within ¼ inch of a portion of the first seam 22. The thickness of the outsole patch and its proximity to the seam 22 advantageously serves to protect the first seam 22 and the area of ​​the midsole 8 at the gap 32 from wear and tear. In some embodiments, the edge of the front corner 66 of the toe outsole patch 26 is within ¼ inch of a portion of the first seam 22.

[0031] In typical embodiments, the distance 104 between the edge of the toe outsole pouch 26 and the first seam 22 is uniform. In some embodiments in which this distance 104 is uniform, (i) the edge of the rear corner 64 and (ii) the edge of the front corner 66 of the toe outsole patch 26 are within 4 / 8 inch, 3 / 8 inch, or 2 / 8 inch, respectively, of the corresponding portions of the first seam 22.

[0032] In some embodiments, the edge of the rear corner 68 of the heel outsole patch 24 is within 3 / 16 inch of a portion of the first seam 22. In some embodiments, the edge of the front corner 70 of the heel outsole patch 24 is within 2 / 4 inch to 3 / 4 inch of a portion of the first seam 22. In some embodiments, the distance 104 between the edge of the heel outsole pouch 24 and the first seam 22 is uniform. In some embodiments in which this distance 104 is uniform, the edge of (i) the rear corner 68 and (ii) the front corner 70 of the heel outsole patch 24 are each within 4 / 8 inch, 3 / 8 inch, or 2 / 8 inch of the corresponding portion of the first seam 22. In some embodiments, the distance 104 between the edge of the heel outsole pouch 24 and the first seam 22 is not uniform. In some embodiments where this distance 104 is not uniform, the edge of the rear corner 68 of the heel outsole patch 26 is within 3 / 8 inch or within 2 / 8 inch of the corresponding portion of the first seam 22 .

[0033] Such close distance 104, combined with the thickness of the rubber and the hardness of the cushioning made possible by the described assembly method, helps protect the midsole 8 and upper 2, thereby ensuring the durability of the shoe while allowing for a foldable design that retains flexibility and comfort.

[0034] Referring to FIG. 9A, a uniquely improved feature of the present shoe is its durability factor value. As used herein, the term "durability factor" is defined as the thickness 106 of the 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 4 mm and the thickness 106 is also 4 mm, resulting in a durability factor of 1. In some embodiments, the distance 104 is 4 mm and the thickness 106 is 5 mm, resulting in a durability factor of 1.25. In some embodiments, the durability factor is between 0.8 and 1.5. In some embodiments, the durability factor is between 0.9 and 1.4. In some embodiments, the durability factor is between 1.0 and 1.3.

[0035] In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 3 / 32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 4 / 32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 5 / 32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 6 / 32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 7 / 32 inch thick. In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are each advantageously at least 8 / 32 inch thick. These thicknesses increase the spring constant of the sole, thereby providing better support for the foot and improving the durability of the shoe. 1 , due to the thickness of the outsole patch and its proximity to the edges, when the shoe is worn on a woman's foot when the woman stands upright relative to the horizontal, the sides of the outsole patch are visible at an angle 100 of at least 45 degrees from the horizontal 102. In some embodiments, when the shoe is worn on a woman's foot when the woman stands upright relative to the horizontal, the sides of the outsole patch are visible at an angle 100 of at least 50 degrees, at least 55 degrees, or at least 60 degrees from the horizontal 102. This visibility of the outsole patch is described herein solely to illustrate the size and shape of the disclosed shoe.

[0036] In some embodiments, the heel outsole patch 24 and the toe outsole patch 26 are made from an elastomer. Exemplary elastomers that may be used include, but are not limited to, natural rubber, vulcanized natural rubber, butadiene-styrene copolymers such as GR-S, neoprene, nitrile rubber, butyl, polysulfide rubber, ethylene-propylene rubber, polyurethane rubber, and silicone rubber, as described in Marks' Standard Handbook for Mechanical Engineers, 1987, Avallone and Baumeister, eds., McGraw-Hill, New York, pp. 6-161 through 1-163, which is incorporated herein by reference. In some embodiments, the midsole 8 is made from leather.

[0037] 6, 6A, and 6B, in some embodiments, a shoe is characterized by a midsole 8. A heel outsole patch 24 and a toe outsole patch 26 are sewn onto a first surface of the midsole 8. The midsole 8 has a second surface having a heel portion 68 and a toe portion 70. In some embodiments, a cushion insert 46 is glued to the heel portion 68 of the second surface of the midsole 8. The insert 46 absorbs shock experienced by the foot when walking on hard surfaces. The insert 46 conforms to the shape of the foot over time. A foam inlay 44 is glued to (i) the cushion insert 46 and (ii) the toe portion 70 of the second surface of the midsole 8. The insole 30 is then secured to the foam inlay 44 with an adhesive. The cushion insert 46 is characterized by a first end 76 and a second end 78. A first end 76 of the cushion insert 46 is bonded to a first portion 72 of the heel portion 68, and a second end 78 of the cushion insert 46 is bonded to a second portion 74 of the heel portion 68. The first portion 72 of the heel portion 68 is closer to the toe portion 70 of the second surface of the midsole 8 than the second portion 74 of the heel portion 68. In some embodiments, the thickness of the first end 76 of the cushion insert 46 is less than the thickness of the second end 78 of the cushion insert 46. In some embodiments, the cushion insert 46 thickens along the cushion insert 46 as a function of distance from the toe portion 70 of the second surface of the midsole 8, such that the thickness of the portion of the cushion insert closest to the toe portion 70 of the midsole is less than the thickness of the portion of the cushion insert 46 farthest 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 functions to improve the support provided by the shoe, particularly at the heel, providing the desired lift and increased stiffness, thereby improving durability.

[0038] In addition to being tapered to improve foot support, the cushion insert 46 is made from a hard material (such as hard ethylene vinyl acetate or similar cushioning material). In some embodiments, the cushion insert 46 has a Shore A hardness of 45-70 or 60-70. In some embodiments, the cushion insert 46 has a Shore A hardness of 0.30 g / cm 3 ~0.5g / cm 3 , 0.40g / cm 3 ~0.5g / cm 3 , 0.45g / cm 3 ~0.5g / cm 3 , or 0.50 g / cm 3 ~0.70g / cm 3 It has a density of

[0039] The thickness of heel outsole patch 24 and toe outsole patch 26, the materials used to construct these patches, their proximity to seam 22, and the ability to add cushioning inserts contribute to significantly improved spring rates over known foldable shoes. In some embodiments, the overall spring rate of the shoe, measured longitudinally at heel portion 68 of the shoe (i.e., in the area of ​​heel outsole patch 24), is between 0.40 kilogram-force / inch and 0.70 kilogram-force / inch. In some embodiments, the overall spring rate of the shoe, measured longitudinally at heel portion 68 of the shoe, is between 0.45 kilogram-force / inch and 0.65 kilogram-force / inch, or between 0.55 kilogram-force / inch and 0.65 kilogram-force / inch. In some embodiments, the overall spring rate of the shoe, measured longitudinally at heel portion 68 of the shoe, is approximately 0.6 kilogram-force / inch. Referring to FIG. 6, portions 68 and 70 are measured separately to arrive at these spring rate measurements. For each region, with the shoe in an upright position, one end (i.e., the end of the portion 68 or 70 that extends longitudinally and faces upward when the shoe is worn) is fixed, and the other end of the portion 68 or 70 of the shoe being measured is subsequently pressed down a fixed distance (e.g., 1 inch), and the force applied by the pressed down end is then measured.

[0040] In some embodiments, the overall shoe spring rate, measured longitudinally at the toe portion 70 of the shoe (i.e., in the area of ​​the toe outsole patch 26), is between 0.40 kilogram-force / inch and 0.70 kilogram-force / inch. In some embodiments, the overall shoe spring rate, measured longitudinally at the toe portion 70 of the shoe, is between 0.45 kilogram-force / inch and 0.65 kilogram-force / inch, or between 0.55 kilogram-force / inch and 0.65 kilogram-force / inch. In some embodiments, the overall shoe spring rate, measured longitudinally at the toe portion 68 of the shoe, is approximately 0.6 kilogram-force / inch.

[0041] Another advantageous feature of some embodiments of the shoe of the present disclosure is deep grooves in the heel outsole patch 24 and the toe outsole patch 26, which aid in stitching the patches to the midsole 8 while protecting the stitching. Deep grooves 48 are possible due to the advantageous design of the outsole patch's proximity to the first seam 22 that secures the upper 2 to the midsole 8 while allowing for the use of thicker outsole patches. Deep grooves 48 protect the stitching that secures the outsole patch to the midsole 9 from contact with the ground, which would wear the stitching and thereby separate the outsole patch. These advantageous features are discussed below. By stitching only the upper 2 to the midsole 8 to form the first seam, rather than additionally stitching the insole 30 to the midsole 8, it is possible to minimize distance 104 and thicken the outsole patches 24 / 26 while still being able to stitch the midsole 8 to the upper 2 using a conventional process, such as a sewing machine. Minimizing distance 104 allows for thickening of outsole patch 24 / 26 (i.e., increasing distance 106) without destabilizing foot support. Thickening of outsole patch 24 / 26 allows for an increase in the depth of first groove 48, thereby providing better protection for the stitching within the groove. Furthermore, a thicker outsole patch stiffens the shoe, allowing for longer use and use on a wider range of terrain (e.g., asphalt, concrete, dirt, etc.). Referring to FIG. 9 , one such advantageous embodiment includes first groove 48 having a depth of at least 3 / 64 inch and formed adjacent to the perimeter of heel outsole patch 24. Heel outsole patch 24 is stitched to the heel portion of the first surface of midsole 8 using a first thread occupying first groove 48. Furthermore, second groove 50 having a depth of at least 3 / 64 inch is formed adjacent to the perimeter of toe outsole patch 26. The toe outsole patch 26 is stitched to the toe portion of the first surface of the midsole 8 using a second thread that occupies the second groove 50. In some embodiments, the first groove 48 is approximately 3 / 32 inch.In some embodiments, the second groove 50 is about 3 / 32 inch.

[0042] 5, upper 2 is formed as a single piece having a first end and a second end joined at the heel cavity by second seam 52. In some embodiments, upper 2 is formed from two or more pieces.

[0043] Referring to Figures 3 and 9, in a typical embodiment, upper 2 is formed as a single piece having (i) a first end (80), (ii) a second end (82), (iii) a first edge (84) (seen in Figure 9), and (iv) a second edge (86). In some embodiments, upper 2 is formed from two or more pieces sewn together. Referring to Figure 3, in a typical embodiment, upper 2 is a single piece having ends 110A and 110B. Of course, upper 2 can be formed from any number of pieces sewn together having ends 110A and 110B. Regardless of whether the upper is made from a single piece or multiple pieces, end 110A (first end) and end 110B (second end) are joined together by second seam 52 at heel cavity 6, thereby completing upper 2. 9, a first edge 84 of the upper 2 is stitched to the perimeter of the midsole 8, thereby forming the second seam 22 and the bottom for the medial portion of the shoe. Referring back to FIG. 3, a first portion of the second edge 86 is characterized by the elastic limiting portion 60, and the first portion of the second edge does not extend to the heel cavity 6. In some embodiments, a second portion of the second edge 86 is characterized by the Achilles cushion 56, which provides an upper boundary for the heel cavity 6. Additionally, referring to FIG. 5, in some embodiments, the half-moon piece 58 covers a lower portion of the second seam 52, while the strip portion 54 covers an upper portion of the second seam 52.

[0044] Referring to FIG. 11 , in some embodiments, the shoes are in a folded state. In this folded state, the shoes can be tucked into a compact storage pouch ( FIG. 12 ) made of stretchy nylon or similar material with a drawstring. This provides convenient transportation of the shoes in a clean and compact state while compressing them to a minimum size. In some embodiments, the pouch includes a pocket for holding a tote bag configured to hold a pair of women's shoes or other items and personal belongings. This allows a person to carry the shoes of the present disclosure in the pouch while on the road, remove the shoes of the present disclosure from the pouch pocket, expand them from the folded state, and then store the previously worn, unwanted shoes in the tote bag.

[0045] The shoes of the present disclosure can advantageously be compressed into a folded state so that they can be stored in a compact box having a lid, such as shown in FIG.

[0046] In some embodiments, the edges of the outsole patch are chamfered in two ways. First, the outer edge of the outsole patch is chamfered at a steep angle for durability and aesthetic reasons. By maintaining a steep chamfer on the outer edge of the outsole patch, a larger gap is maintained between the walking surface and the flexible elements of the footwear, thereby improving durability. Second, in some embodiments, the inner edge of one or more outsole patches is chamfered. Chamfering the outsole patch in this manner reduces pressure between the edge of the outsole patch and the more flexible midsole. This chamfering process blunts and softens the edge of the outsole patch that is not secured to the midsole. Softening this edge improves the durability and longevity of the footwear.

[0047] As discussed above, prior art split-sole footwear has certain limitations. In some embodiments, the shortcomings of the prior art are overcome by providing a shoe that achieves a maximum outsole ratio (OR), where OR is defined as follows:

[0048] OR=(D×T×W) / M In the above formula, D = average depth of second groove portion 50; T = average thickness of the toe outsole patch 26, W = maximum width of the toe outsole patch 26, M = width of midsole 8 at the widest point of toe outsole patch 26, where W is less than M, and D, T, W, and M are all given in the same units of length (e.g., millimeters).

[0049] Thus, in some embodiments, the shoe of the present disclosure has an outsole ratio OR. When this ratio is maximized, the toe outsole patch 26 is thickened, the depth of the second groove 50 where the stitching of the toe outsole patch 26 is made is increased, and the toe outsole patch 26 is closer to the edge of the footwear. In some embodiments, an acceptable outsole ratio requires the toe outsole patch 26 to be as narrow as possible while still accommodating a wide range of foot widths. The narrower the toe outsole patch 26, the more compact and portable the footwear will be and the better it will accommodate narrow feet. A thickened toe outsole patch 26 is important for foot safety and comfort when walking on uneven surfaces.

[0050] Furthermore, as the toe outsole patch 26 narrows, the depth of the second stitching groove 50 becomes more important because the seam area experiences greater contact with the walking surface. Therefore, deeper grooves 50 are needed to protect the seam stitching. The proximity of the toe outsole patch 26 to the midsole 8 and the edge of the upper 2 that it covers also becomes more important as the toe outsole patch 26 narrows. The advantages of a toe outsole patch 26 close to the edge of the footwear have been presented above. It will be apparent in light of the present disclosure that these same principles apply to the heel outsole patch 24 and the first groove 48.

[0051] Table 1 below shows preferred values ​​for the average depth (D) of the second groove portion 50, the average thickness (T) of the toe outsole patch 26, the maximum width (W) of the toe outsole patch 26, and the width (M) of the midsole 8 at the point of the maximum width of the toe outsole patch 26 according to embodiments of the present disclosure.

[0052] [Table 1]

[0053] In some embodiments, a shoe of the present disclosure has an outsole ratio of 7.0 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 7.2 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 7.4 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 7.6 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 7.8 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 8.0 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 8.2 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 8.4 or greater. In some embodiments, a shoe of the present disclosure has an outsole ratio of 8.6 or greater. Achieving an outsole ratio of this magnitude provides several benefits that increase the potential for split-sole footwear.

[0054] Tables 2 and 3 below show preferred values ​​for the average depth (D) of the second groove portion 50, the average thickness (T) of the toe outsole patch 26, the maximum width (W) of the toe outsole patch 26, and the width (M) of the midsole 8 at the point of the maximum width of the toe outsole patch 26, according to embodiments of the present disclosure.

[0055] [Table 2]

[0056] [Table 3]

[0057] In some embodiments, a shoe is provided that achieves a maximum outsole ratio (OR), where OR is defined as follows:

[0058] OR'=(D'×T'×W') / M' In the above formula, The average depth of the second groove portion 50, D'=2.0 mm to 3.0 mm; T' = average thickness of the toe outsole patch 26, which is at least 3.0 mm; W' = the maximum width of the toe outsole patch 26, which is between 60 mm and 89 mm; M'=W'=the width of the midsole 8 at the widest point of the toe outsole patch 26, which is greater than 70 mm to 93 mm; OR' is a value between 7.0 and 8.6.

[0059] In some embodiments, T' has a value of at least 4.0 mm, at least 5.0 mm, at least 6.0 mm, at least 7.0 mm, at least 8.0 mm, or at least 9.0 mm.

[0060] The primary benefit of shoes that meet this OR measure is improved comfort. A thicker outsole patch allows for more cushioning between the foot and the walking surface, minimizing impacts with hard objects. A wider outsole patch closer to the edge of the shoe provides more coverage to the bottom of the foot, preventing the foot from feeling the discomfort of pressing against the edge of the outsole, or worse, sagging from the rubber edge.

[0061] The second benefit is improved foot protection. A thicker outsole provides a better barrier, thereby better protecting the foot against hard or sharp objects. Additionally, a wider outsole provides better protection and coverage for the foot.

[0062] A third benefit is improved durability. An outsole that is closer to the edge of the shoe protects the seam stitching, the outsole (24 and 26), the midsole (8), and other sensitive shoe components. A thicker outsole (24 and 26) provides more of the outsole for wear before sensitive shoe components (e.g., midsole 8) are worn away by contact with the ground. Deeper grooves (e.g., first groove 48 and second groove 50) better protect the outsole stitching, so the outsole stitching wears less quickly.

[0063] A fourth benefit is the possibility of a more flattering style. That is, a narrow shoe can stretch to accommodate a wider foot when needed. This is achieved by the deep grooves (e.g., first groove 48 and second groove 50), which protect the stitching from greater contact between the grooves (and therefore the stitching within the grooves) and the ground on narrower shoes. This is further achieved by the thickened outsole patches (e.g., heel outsole patch 24 and toe outsole patch 26) that are close to the edges. This proximity to the edges is even more important on narrower shoes, since some feet are wider than the outsole. Here, the thickness of the outsole prevents wider feet from pushing the seam / midsole 8 / upper 2 down onto the ground.

[0064] A fifth advantage is that the area of ​​the non-foldable heel outsole patch 24 and toe outsole patch is minimized, thereby increasing the portability of the shoe and making the shoe more compact.

[0065] Representative Embodiments The following are non-limiting representative embodiments of the present disclosure.

[0066] Embodiment A an upper defining an interior portion for receiving a person's foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; a heel outsole patch stitched to a heel portion of the first surface of the midsole; a toe outsole patch stitched to a toe portion of the first surface of the midsole; an insole secured to the bottom of the inner portion by adhesive; A shoe comprising: a gap exists between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the insole is not stitched to the upper or the midsole; (ii) the heel outsole patch and the toe outsole patch are each made from an elastomer; shoes.

[0067] Embodiment B an upper defining an interior portion for receiving a person's foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; a heel outsole patch stitched to a heel portion of the first surface of the midsole; a toe outsole patch stitched to a toe portion of the first surface of the midsole; an insole secured to the bottom of the inner portion by adhesive; A shoe comprising: a gap exists between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the insole is not stitched to the upper; (ii) the area of ​​the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and the insole has a spring constant of between 0.40 kilogram-force per inch and 0.70 kilogram-force per inch; shoes.

[0068] Embodiment C an upper defining an interior portion for receiving a person's foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; a heel outsole patch stitched to a heel portion of the first surface of the midsole; a toe outsole patch stitched to a toe portion of the first surface of the midsole; an insole secured to the bottom of the inner portion by adhesive; A shoe comprising: a gap exists between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the insole is not stitched to the upper; (ii) a rear corner of the toe outsole patch is within ¼ inch of a portion of the first seam; shoes.

[0069] Embodiment D an upper defining an interior portion for receiving a person's foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; a heel outsole patch stitched to a heel portion of the first surface of the midsole; a toe outsole patch stitched to a toe portion of the first surface of the midsole; an insole secured to the bottom of the inner portion by adhesive; A shoe comprising: a gap exists between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the insole is not stitched to the upper; (ii) a first groove having a depth of at least 3 / 64 inch is formed adjacent a perimeter of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread that occupies the first groove; (iii) a second groove having a depth of at least 3 / 64 inch is formed adjacent to a perimeter of the toe outsole patch, and the toe outsole patch is stitched to the toe portion of the first surface of the midsole using a second thread that occupies the second groove. shoes.

[0070] Embodiment E an upper defining an interior portion for receiving a person's foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; a heel outsole patch stitched to a heel portion of the first surface of the midsole; a toe outsole patch stitched to a toe portion of the first surface of the midsole; an insole secured to the bottom of the inner portion by adhesive; A shoe comprising: a gap exists between (i) the heel outsole patch sewn to the heel portion of the first surface of the midsole and (ii) the toe outsole patch sewn to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the area of ​​the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and the insole has a spring constant between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch; (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.5; shoes.

[0071] Embodiment F A method for manufacturing shoes, comprising: (A) stitching a heel outsole patch to a heel portion of a first surface of a midsole; (B) stitching a toe outsole patch to a toe portion of the first surface of the midsole; (C) securing a cushion insert to the heel portion of the second surface of the midsole; (D) stitching an upper forming an inner portion for receiving a person's foot, the inner portion having a toe cavity and a heel cavity, to the midsole having (i) a toe tip portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, wherein stitching (D) stitches a perimeter of the midsole to the upper, thereby forming a bottom for the inner portion surrounded by a first seam; (E) securing an insole to the bottom of the medial portion with an adhesive; Including, the stitching (A) and the stitching (B) form a gap between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the insole is not stitched to the upper or the midsole; (ii) the heel outsole patch and the toe outsole patch are each made from an elastomer; method.

[0072] Embodiment G A method for manufacturing shoes, comprising: (A) stitching a heel outsole patch to a heel portion of a first surface of a midsole; (B) stitching a toe outsole patch to a toe portion of the first surface of the midsole; (C) stitching an upper forming an inner portion for receiving a person's foot, the inner portion having a toe cavity and a heel cavity, to the midsole having (i) a toe tip portion, (ii) a heel end portion, (iii) an inner side portion, and (iv) an outer side portion, wherein by stitching (C), a perimeter of the midsole is stitched to the upper, thereby forming a bottom for the inner portion surrounded by a first seam; (D) securing an insole to the bottom of the medial portion with an adhesive; Including, the stitching (A) and the stitching (B) form a gap between (i) the heel outsole patch stitched to the heel portion of the first surface of the midsole and (ii) the toe outsole patch stitched to the toe portion of the first surface of the midsole, the gap extending from the medial side to the lateral side and occupying a position midway between the toe end and the heel end, whereby the entire shoe can be folded about an axis at the gap extending between the medial side and the lateral side; the shoe is configured to fold between (i) an extended state in which the heel outsole patch and the toe outsole patch are coplanar or nearly coplanar, and (ii) a folded state in which the shoe is bent about the axis so that a portion of the upper including the toe cavity is forced into the heel cavity; (i) the area of ​​the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and the insole has a spring constant between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch; (ii) the toe outsole patch or the heel outsole patch has a durability coefficient of 0.8 to 1.5; method.

[0073] Embodiment H-1 Any one of embodiments A, B, C, D, E, F, and G, wherein the midsole is made of leather.

[0074] Embodiment H-2 Any one of embodiments A, B, C, D, E, F, and G, wherein the bottom of the inner portion further comprises a foam inlay, and the insole is secured to the foam inlay by an adhesive.

[0075] Embodiment H-3 Any one of embodiments A, B, C, D, E, F, and G, wherein the medial portion further comprises a cushion insert bonded to the heel portion of the second surface of the midsole.

[0076] Embodiment H-4 the midsole comprising a second surface having a heel portion and a toe portion; The medial portion further includes a cushion insert bonded to the heel portion of the second surface of the midsole. the foam inlay is bonded to (i) the cushion insert and (ii) the toe portion of the second surface of the midsole; H-2 embodiment.

[0077] Embodiment H-5 the cushion insert is characterized by a first end and a second end; the first end of the cushion insert is bonded to a first portion of the heel portion and the second end of the cushion insert is bonded to a second portion of the heel portion, the first portion of the heel portion being closer to the toe portion of the second surface of the midsole than the second portion of the heel portion; the first end of the cushion insert is thinner than the second end of the cushion insert; H-3 embodiment.

[0078] Embodiment H-6 Embodiment H-3, wherein the cushion insert thickens along the insert as a function of distance from the toe portion of the second surface of the midsole, such that the portion of the cushion insert closest to the toe portion of the midsole is thinner than the portion of the cushion insert furthest from the toe portion of the midsole.

[0079] Embodiment H-7 An embodiment of H-3, wherein the cushion insert comprises an ethylene vinyl acetate type or a polyurethane type material.

[0080] Embodiment H-8 An embodiment of H-3, wherein the cushion insert has a Shore A hardness of 45-70 or 60-70.

[0081] Embodiment H-9 The cushion insert is 0.30 g / cm 3 ~0.7g / cm 3 3. An embodiment of H-3 having a density of

[0082] Embodiment H-10 The cushion insert is 0.40 g / cm 3 ~0.7g / cm 3 3. An embodiment of H-3 having a density of

[0083] Embodiment H-11 a first groove having a depth of at least 3 / 64 inch formed adjacent a perimeter of the heel outsole patch, and the heel outsole patch is stitched to the heel portion of the first surface of the midsole using a first thread that occupies the first groove; a second groove having a depth of at least 3 / 64 inches is formed adjacent to a perimeter of the toe outsole patch, and the toe outsole patch is sewn to the toe portion of the first surface of the midsole using a second thread that occupies the second groove; Any one of embodiments A, B, C, D, E, F, and G.

[0084] Embodiment H-12 Any one 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 being joined by a second seam at the heel cavity.

[0085] Embodiment H-13 the upper is integrally formed 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 at the heel cavity; the first edge is stitched to the perimeter of the midsole, thereby forming the base for the medial portion; a first portion of the second edge characterized by an elastic limiting portion, the first portion of the second edge not extending into the heel cavity; Any one of embodiments A, B, C, D, E, F, and G.

[0086] Embodiment H-14 Any one of embodiments A, B, C, D, E, F, and G, wherein the second portion of the second edge is characterized by an Achilles cushion that provides an upper boundary for the heel cavity.

[0087] Embodiment H-15 the upper is integrally formed having a first end and a second end; the first end and the second end are joined by a second seam at the heel cavity; a half-moon shaped piece covering a lower portion of the second seam; Any one of embodiments A, B, C, D, E, F, and G.

[0088] Embodiment H-16 Any one of embodiments A, B, C, D, E, F, and G, wherein the shoe is in a folded state and tucked into a pouch having a drawstring.

[0089] Embodiment H-17 An H-16 embodiment, wherein the pouch includes a pocket for holding a tote bag, the tote bag configured to accommodate a pair of shoes.

[0090] Embodiment H-18 Any one of embodiments A, B, C, D, E, F, and G, wherein the shoes are in a folded state and are pushed into a compact box having a lid.

[0091] Embodiment H-19 Any one 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.

[0092] Embodiment H-20 Any one of embodiments A, B, C, D, E, F, and G, wherein a rear corner of the toe outsole patch is within 3 / 16 inch of a portion of the first seam.

[0093] Embodiment H-21 Any one 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.

[0094] Embodiment H-22 Any one 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.

[0095] Embodiment H-23 Any one 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.

[0096] Embodiment H-24 Any one of embodiments A, B, C, D, E, F, and G, wherein the toe outsole patch or the heel outsole patch has a durability factor of 0.8 to 1.5.

[0097] Embodiment H-25 Any one of embodiments A, B, C, D, E, F, and G, wherein the toe outsole patch or the heel outsole patch has a durability factor of 1.0 to 1.3.

[0098] Embodiment H-26 Any one of embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch each have a thickness of at least 3 / 32 inch.

[0099] Embodiment H-27 Any one of embodiments A, B, C, D, E, F, and G, wherein the heel outsole patch and the toe outsole patch each have a thickness of about 5 / 32 inch.

[0100] Embodiment H-28 Any one of embodiments A, B, C, D, E, F, and G, wherein the spacing is between 4 / 8 inch and 6 / 8 inch.

[0101] Embodiment H-29 Any one of embodiments A, B, C, D, E, F, and G, wherein the spacing is about 5 / 8 inch.

[0102] Embodiment H-30 Any one of embodiments A, B, C, D, E, F, and G, wherein the side of said heel outsole patch is visible at an angle of at least 45 degrees from the horizontal when the shoe is worn on the foot of a person standing on a horizontal surface.

[0103] Embodiment H-31 Any one of embodiments A, B, C, D, E, F, and G, wherein the side of said toe outsole patch is visible at an angle of at least 45 degrees from the horizontal when the shoe is worn on the foot of a person standing on a horizontal surface.

[0104] Embodiment H-32 Any one of embodiments A, B, C, D, E, F, and G, wherein the area of ​​the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and insole has a spring constant of between 0.40 kilogram-force per inch and 0.70 kilogram-force per inch.

[0105] Embodiment H-33 Any one of embodiments A, B, C, D, E, F, and G, wherein the area of ​​the shoe defined by the heel outsole patch and including the corresponding portions of the midsole and insole has a spring constant of between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch.

[0106] Embodiment H-34 Any one of embodiments A, B, C, D, E, F, and G, wherein the area of ​​the shoe defined by the toe outsole patch and including the corresponding portions of the midsole and insole has a spring constant of between 0.40 kilogram-force per inch and 0.70 kilogram-force per inch.

[0107] Embodiment H-35 Any one of embodiments A, B, C, D, E, F, and G, wherein the area of ​​the shoe defined by the toe outsole patch and including the corresponding portions of the midsole and insole has a spring constant of between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch.

[0108] Embodiment H-36 Any one of embodiments A, B, C, D, E, F, and G, wherein the shoe is a woman's shoe.

[0109] Embodiment H-37 Any one of embodiments A, B, C, D, E, F, and G, wherein the shoe is a men's shoe.

[0110] Embodiment H-38 Any one of embodiments A, B, C, D, E, F, and G, wherein the shoe is a men's shoe, a women's shoe, or a child's shoe.

[0111] References and Alternative Embodiments All references cited herein are incorporated by reference in their entirety for all purposes to the same extent as if each individual publication, patent, or patent application was specifically and individually indicated to be incorporated by reference in its entirety for all purposes.

[0112] As will be apparent to those skilled in the art, numerous modifications and variations are possible without departing from the spirit and scope of the invention. The specific embodiments described herein are provided merely as examples. These embodiments have been chosen and described in order to best explain the principles of the invention and its practical application, and to thereby enable others skilled in the art to utilize the invention, and its various modifications, in various embodiments, in the best mode suited to the particular uses contemplated.

[0113] The present disclosure applies to a variety of footwear styles (in addition to the basic ballet flats / slippers shown in the drawings). For example, sandals, flip-flops, and active sports shoes can be made with similar configurations for flexible compression and compact storage and are fully within the scope of the present invention. Furthermore, while embodiments designed for women have been disclosed, it will be apparent that such shoes may also be designed for men or children, or a combination of women, men, and children. All such alternative designs are fully within the scope of the present disclosure.

[0114] The core shoe design and compact storage pouch described herein offer the potential for cosmetic differentiation through decoration, materials, and colors, thereby increasing commercial appeal. Alternative construction methods may include gluing the outsole to the midsole without any stitching. The present invention is limited only by the language of the appended claims, along with the full range of equivalents to which such claims are entitled.

Claims

1. an upper defining an interior portion for receiving a foot, the interior portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being secured to the upper to form a bottom for the medial portion; an insole secured to the bottom of the inner portion; an outsole patch having (i) a toe portion disposed at the toe end portion of the midsole; and (ii) a heel portion disposed at the heel end portion of the midsole, the outsole patch having a contour configured to provide a gap between the toe end portion and the heel end portion of the midsole and the ground when worn; A shoe comprising: an area between (i) the heel portion of the outsole patch and (ii) the toe portion of the outsole patch, the area extending from the medial side to the lateral side and occupying a first surface of the midsole at a location intermediate the toe end of the midsole and the heel end of the midsole, thereby allowing the shoe to be folded about the area; The shoe, wherein the insole is not sewn to the upper or the midsole.

2. The shoe of claim 1 , wherein the midsole is made of leather.

3. The shoe of claim 1 , wherein the bottom of the inner portion further comprises a foam inlay, and the insole is secured to the foam inlay by an adhesive.

4. the midsole has a second surface opposing the first surface extending from the toe end to the heel end of the midsole; The shoe of claim 1 , wherein the medial portion further comprises a cushioning insert adhered to a heel portion of the second surface of the midsole.

5. the midsole has a second surface opposing the first surface extending from the toe end to the heel end of the midsole; the medial portion further comprises a cushion insert adhered to a heel portion of the second surface of the midsole; The shoe of claim 3 , wherein the foam inlay is adhered to (i) the cushion insert and (ii) the toe portion of the second surface of the midsole.

6. 5. The shoe of claim 4, wherein the cushion insert increases in thickness along the insert as a function of distance from the toe portion of the second surface of the midsole such that the thickness of the cushion insert closest to the toe portion of the midsole is less than the thickness of the cushion insert farthest from the toe portion of the midsole.

7. The shoe of claim 4 , wherein the cushion insert comprises an ethylene vinyl acetate or polyurethane material.

8. 5. The shoe of claim 4, wherein the cushion insert has a Shore A hardness of 45-70.

9. 2. The shoe of claim 1, wherein a first groove having a depth of at least 3 / 64 inch is formed adjacent a perimeter of the outsole patch, and the outsole patch is stitched to a heel portion of the first surface of the midsole using a first thread that occupies the first groove.

10. 10. The shoe of claim 1, wherein the upper is integrally formed having a first end and a second end, the first end and the second end being sewn together at a second seam in the heel cavity.

11. the upper is integrally formed having a first end and a second end; the first end and the second end are sewn together at a second seam in the heel cavity; The shoe of claim 1 , wherein a half-moon shaped piece covers a lower portion of the second seam.

12. 2. The shoe of claim 1, wherein the outsole patch has a durability factor of 0.8 to 1.5, the durability factor being the thickness of the outsole patch divided by the distance between an edge of the outsole patch and a first seam that encircles the bottom of the medial portion.

13. 2. The shoe of claim 1, wherein the outsole patch has a durability factor of 1.0 to 1.3, the durability factor being the thickness of the outsole patch divided by the distance between an edge of the outsole patch and a first seam that encircles the bottom of the medial portion.

14. 10. The shoe of claim 1, wherein the area of ​​the shoe defined by the heel portion of the outsole patch and including corresponding portions of the midsole and insole has a spring constant, measured longitudinally at the heel portion of the shoe, of between 0.40 kilogram-force per inch and 0.70 kilogram-force per inch.

15. 10. The shoe of claim 1, wherein the area of ​​the shoe defined by the heel portion of the outsole patch and including corresponding portions of the midsole and insole has a spring constant, measured longitudinally at the heel portion of the shoe, of between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch.

16. The shoe of claim 1 , wherein the insole is secured to the bottom of the inner portion by adhesive.

17. The shoe of claim 1 , wherein the midsole is stitched to the upper, thereby forming the bottom for the medial portion surrounded by a first seam.

18. 18. The shoe of claim 17, wherein a rear corner of the toe portion of the outsole patch is within 1 / 4 inch of a portion of the first seam.

19. 18. The shoe of claim 17, wherein a rear corner of the toe portion of the outsole patch is within 3 / 16 inch of a portion of the first seam.

20. 18. The shoe of claim 17, wherein a front corner of the toe portion of the outsole patch is within 1 / 4 inch of a portion of the first seam.

21. 18. The shoe of claim 17, wherein a rear corner of the heel portion of the outsole patch is within 3 / 16 inch of a portion of the first seam.

22. 18. The shoe of claim 17, wherein a rear corner of the heel portion of the outsole patch is within 1 / 4 inch of a portion of the first seam.

23. The shoe of claim 1 , wherein the outsole patch is stitched to the first surface of the midsole.

24. an upper defining an inner portion for receiving a female foot, the inner portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; an insole secured to the bottom of the inner portion; A shoe comprising an outsole having (i) a toe portion disposed at the toe tip portion of the midsole, and (ii) a heel portion disposed at the heel end portion of the midsole, an area between (i) the heel portion of the outsole and (ii) the toe portion of the outsole, the area extending from the medial side to the lateral side and occupying a position intermediate the toe end of the midsole and the heel end of the midsole, thereby allowing the shoe to be folded around the area; The shoe, wherein the heel portion of the outsole has a durability coefficient of 0.8 to 1.5, the durability coefficient being a value obtained by dividing a thickness of the heel portion of the outsole by a distance between an edge of the heel portion of the outsole and the first seam.

25. 25. The shoe of claim 24, wherein the insole is secured to the bottom of the inner portion by adhesive.

26. 25. The shoe of claim 24, wherein the midsole is stitched to the upper to form a bottom for the medial portion surrounded by a first seam.

27. 27. The shoe of claim 26, wherein a rear corner edge of the toe portion of the outsole is within 1 / 4 inch of a portion of the first seam.

28. 27. The shoe of claim 26, wherein a rear edge of the toe portion of the outsole is within 3 / 16 inch of a portion of the first seam.

29. 27. The shoe of claim 26, wherein a leading edge of the toe portion of the outsole is within 1 / 4 inch of a portion of the first seam.

30. 27. The shoe of claim 26, wherein a rear edge of the heel portion of the outsole is within 3 / 16 inch of a portion of the first seam.

31. 27. The shoe of claim 26, wherein a rear edge of the heel portion of the outsole is within 1 / 4 inch of a portion of the first seam.

32. 25. The shoe of claim 24, wherein the outsole is stitched to the first surface of the midsole.

33. 25. The shoe of claim 24, wherein the portion of the shoe defined by the heel portion of the outsole and including the corresponding portions of the midsole and insole has a spring constant of between 0.45 kilogram-force per inch and 0.55 kilogram-force per inch.

34. The shoe according to claim 24, wherein the durability factor is between 0.9 and 1.

4.

35. The shoe according to claim 24, wherein the durability factor is between 1.0 and 1.

3.

36. a first groove having a depth of at least 3 / 64 inch formed adjacent an edge of the heel portion of the outsole, the heel portion of the outsole being stitched to the midsole using a first thread occupying the first groove; 25. The shoe of claim 24, wherein a second groove having a depth of at least 3 / 64 inch is formed in the outsole adjacent an edge of the toe portion, and the toe portion of the outsole is stitched to the midsole with a second thread occupying the second groove.

37. an upper defining an inner portion for receiving a female foot, the inner portion including a toe cavity and a heel cavity; a midsole having (i) a toe end, (ii) a heel end, (iii) a medial side, and (iv) a lateral side, the perimeter of the midsole being stitched to the upper to form a bottom for the medial portion surrounded by a first seam; an outsole having (i) a toe portion disposed at the toe end of the midsole; and (ii) a heel portion disposed at the heel end of the midsole; an insole fixed to the bottom of the inner part, an area between (i) the heel portion of the outsole and (ii) the toe portion of the outsole, the area extending from the medial side to the lateral side and occupying a position intermediate the toe end of the midsole and the heel end of the midsole, thereby allowing the shoe to be folded around the area; the heel portion of the outsole has a first durability factor of 0.8 to 1.5, the first durability factor being a value obtained by dividing a thickness of the heel portion of the outsole by a distance between an edge of the heel portion of the outsole and the first seam; the toe portion of the outsole has a second durability factor of 0.8 to 1.5, the second durability factor being a thickness of the toe portion of the outsole divided by a distance between an edge of the toe portion of the outsole and the first seam.

38. 38. The shoe of claim 37, wherein a rear edge of the heel portion of the outsole is within 3 / 16 inch of a portion of the first seam.

39. 38. The shoe of claim 37, wherein a rear edge of the heel portion of the outsole is within 1 / 4 inch of a portion of the first seam.

40. the first durability factor is 0.9 to 1.4; The shoe according to claim 37, wherein the second durability factor is between 0.9 and 1.

4.

41. the first durability factor is 1.0 to 1.3; The shoe according to claim 37, wherein the second durability factor is between 1.0 and 1.

3.

42. a first groove having a depth of at least 3 / 64 inch formed adjacent an edge of the heel portion of the outsole, the heel portion of the outsole being stitched to the midsole using a first thread occupying the first groove; 38. The shoe of claim 37, wherein a second groove having a depth of at least 3 / 64 inch is formed in the outsole adjacent an edge of the toe portion, and the toe portion of the outsole is stitched to the midsole with a second thread occupying the second groove.

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