Hands-free footwear

Abstract

This invention discloses a hands-free shoe, relating to the field of shoemaking technology. Addressing the problems of traditional hands-free shoes, such as the appearance being compromised by the upturned heel structure and the difficulty in balancing on / off comfort and stability, this invention incorporates a shaping component composed of multi-curvature surfaces within the heel counter. This component is integrally molded using a resin alloy mold and includes a sliding section, a support section, an extension section, and a protrusion. A T-shaped support rib is formed at the center of the protrusion and support section, and the extension section is adapted for injection molding. This invention maintains aesthetic appeal through the smooth contour of the shaping component, integrates the guiding function of the sliding section with the fixing function of the protrusion and extension section, achieving both hands-free on / off comfort and stable maintenance. It also boasts excellent shape retention and durability, is easy to manufacture, and is highly versatile, suitable for various types of footwear such as dress shoes and athletic shoes.

Description

Technical Field

[0001] This invention relates to the field of shoemaking technology, and in particular to a hands-free shoe. Background Technology

[0002] In recent years, hands-free shoes (including athletic shoes, casual shoes, and dress shoes) that can be put on and taken off standing up without using your hands or bending over have become increasingly popular. In order to allow the heel to slide smoothly into the back of the shoe, a "slide-type inverted structure" that tilts the upper part of the back of the shoe backward and upward is commonly used. However, this structure has the problem of damaging the aesthetic appearance.

[0003] Especially for dress shoes worn in business or formal occasions, the smoothness of the upper, the neat outline of the shoe, and its refined aesthetics are extremely important requirements. However, in various types of shoes, including dress shoes, the heel counter or reinforcing components traditionally used to assist in putting on and taking off the shoe often have their upper or side edges clearly exposed on the outside of the shoe. Therefore, for dress shoes, this not only disrupts the shoe's aesthetic outline and damages its appearance, but also presents a common problem in other types of footwear, such as athletic shoes or casual shoes, which compromises the overall aesthetic and design intent.

[0004] Formal shoes, designed to meet the stringent requirements of business occasions, place particular emphasis on a smooth and refined appearance. However, in other types of footwear, depending on their purpose or design philosophy, "unobtrusive structure" and "aesthetic appeal" may also be important requirements. Traditionally, to improve ease of on and off, various shoes have been fitted with reinforcing components or heel counters. However, these components are structurally prone to outward curling or exposed edges, resulting in a common problem of degraded overall shoe appearance.

[0005] In other words, among all hands-free shoes (including dress shoes), balancing ease of on and off with a smooth / aesthetically pleasing appearance has become a common challenge. This challenge is particularly prominent in dress shoes, but the potential demand also exists in other types of footwear.

[0006] Patent document 1 (International Publication No. 2023 / 064568) discloses a heel cup with a complex S-shaped profile in a side view, especially with its upper edge curving backward and upward. Therefore, when viewed from the outside of the shoe, it is easily perceived as a noticeable upward curve, disrupting the clean, upright silhouette sought by formal shoes and other footwear. Furthermore, the central portion of this heel cup is thin, while the surrounding areas, particularly the inner and outer edges, are thick. Consequently, after molding, its outline is easily visible beneath the upper material, also detracting from its aesthetic appeal.

[0007] Patent document 2 (ZL2024201202851) discloses a shaped heel counter that is characterized by the apex of the arched part extending upwards and backwards in an arc shape. This structure inevitably results in the upper part of the heel counter of shoes made with this shaped heel counter having a backward-upward curved shape. In addition, when the tray part of this shaped heel counter is subjected to downward pressure, the tray part will deform as if it were upturned, which will then be transmitted to the outer leather upper material, causing the upper material to produce unnatural bending and wrinkles easily over time.

[0008] Patent document 3 (Japanese Patent No. 7523103) discloses a crescent-shaped support member, the upper rear part of which has a shape that curves backward in the direction of the shoe's forefoot / rearfoot orientation. This structural feature makes the curved portion easily perceived as a noticeable protrusion when viewed from the outside of the shoe. Furthermore, this crescent-shaped support member is an inverted triangle with a narrow lower part and a small support base. This shape makes it difficult to provide sufficient support rigidity for repeated stepping loads and stress during putting on and taking off, resulting in problems with structural stability and durability over long-term use.

[0009] Traditional shaping materials such as chemical sheets or hot melt adhesives can provide short-term support and shaping, but they lack a structure that allows for easy on and off. Furthermore, these materials are susceptible to deformation due to aging and repeated foot traffic, making it difficult to maintain their initial shape and prone to indentation or deformation at the heel, posing a fundamental problem with durability.

[0010] Therefore, while traditional hands-free shoe technology offers a degree of convenience in putting on and taking off, its structure often compromises the refined silhouette or smooth appearance required for formal shoes and other footwear, making it difficult to balance aesthetics and practicality. Consequently, shoe manufacturers urgently need a manufacturing technology that can achieve hands-free functionality while maintaining a superior appearance; and consumers also expect shoes that match the taste of specific occasions while providing a comfortable and convenient wearing experience. Summary of the Invention

[0011] To address the aforementioned issues with the appearance and practicality of traditional hands-free shoes, this invention provides a hands-free shoe with a novel shaping component.

[0012] The shoes involved in this invention typically include basic components such as the shoe opening and the heel counter. However, the improvement focuses not on making complex changes to these basic structures, but on integrating a shaping component composed of multiple curved surfaces with different radii of curvature into the heel counter to achieve a hands-free (unassisted putting on and taking off) function without compromising the aesthetic appearance.

[0013] In some embodiments of the present invention, the hands-free shoe of the present invention includes an upper made of leather or cloth, and a shaping component made of multiple curved surfaces with different radii of curvature is fitted to the heel of the shoe.

[0014] The shaping component is integrally molded from resin material using an alloy mold, possessing both excellent support and flexibility.

[0015] The shaping component includes a sliding part, a support part, an extension part, and a protrusion located below the sliding part and protruding towards the toe of the shoe.

[0016] In the side view, the sliding part is inclined diagonally backward toward the foot, and in the top view, its two sides are arc-shaped and inclined downward, thus forming a guide structure for guiding the heel into the shoe.

[0017] Preferably, the inner and outer sides of the sliding part extend diagonally forward of the shoe to form two side wings, and the angle at which the extension lines of the two side wings intersect is an acute angle.

[0018] Preferably, the extension bulges to the right in the right-side view and is arc-shaped on both sides and tilts upward in the bottom view, forming a shape that fits the heel.

[0019] Preferably, in a side view, at least a portion of the protrusion protrudes most towards the toe relative to other parts of the shaping component.

[0020] Preferably, in a side view, the protrusion, the support, and the extension are shaped to fit the heel.

[0021] Preferably, in the front view, the upper part of the shaping component is arc-shaped, and the two sides of its upper part gradually widen obliquely downward from the sliding part to the extension part.

[0022] Preferably, in a side cross-sectional view, the rear side of the shaping component has no obvious concave or convex shape, its rear contour line is smooth, and it extends in a single direction from the top to the bottom or is approximately straight.

[0023] Preferably, the lining material at the top of the heel counter forms a slide-shaped curved surface that slopes inwards into the shoe, and the upper part of the lining material extends upwards to cover the topmost part of the heel counter.

[0024] Preferably, the lining material including the protrusion bulges towards the toe to form a raised portion, and in a side cross-sectional view, the most prominent point of the raised portion protrudes towards the toe.

[0025] Preferably, at least a portion of the thickness of the protrusion is the thickest among the other parts of the shaping component.

[0026] Preferably, the thickness of the protrusion extends across the support portion and gradually thins towards the end of the edge of the extension portion.

[0027] Preferably, an end portion that can be drawn with a line is formed at the end of the edge of the extension portion.

[0028] Preferably, the extension has one or more hollow structures (notches) to accommodate various shoe last sizes.

[0029] Preferably, the support portion is thickest in the central region and gradually thins towards the edge region, forming an end that can be drawn with a line at the edge.

[0030] Furthermore, the protrusion and the central region of the support form a T-shaped support keel for the shaping component, the protrusion forming a T-shaped transverse section, and the central region of the support forming a T-shaped longitudinal section.

[0031] Preferably, the shaping component is integrated and reinforced by shaping materials such as chemical sheets or hot melt adhesives.

[0032] Preferably, a sewn part is provided at the top of the heel counter, which is a structure for fixing the shaping component to the top of the heel counter.

[0033] Preferably, the extended portion has a thickness that enables the last and sole mold to be sealed during the injection molding process.

[0034] Preferably, the raised portion forms a raised structure when the hands-free shoe is installed, so as to fit the heel and make the hands-free shoe less likely to fall off.

[0035] Preferably, the width of the opening at the heel of the shoe is less than the width of the human heel in the horizontal direction, and the radius of curvature of the shape formed by the shoe opening inside the hands-free shoe is set to be less than the natural radius of curvature of the human heel.

[0036] Preferably, the installation method of the shaping component is simple and does not require a complicated heel counter wrapping process. In the manufacturing process, the sewn part on the upper part of the shaping component is fixed to the top of the heel counter by machine sewing or hand sewing. In the subsequent reversing process, the extended part of the shaping component is sewn together with the upper material and the lining material, thereby firmly installing the shaping component to the heel counter.

[0037] Preferably, the lower part of the shaping component is reinforced with shaping materials such as chemical sheet (chemically treated sheet material) or hot melt adhesive (material that functions as an adhesive by heating) to ensure the shape stability and support of the shaping component. At the same time, the lower part of the shaping component is sewn to the lower part of the heel counter of the shoe upper material to further fix its position.

[0038] Preferably, the shaping component is made of a resin material with support and elasticity, such as TPU, TPE, TPEE and other highly elastic new materials, which have good elasticity and toughness characteristics, can provide sufficient support, and have the advantages of wear resistance, durability and high temperature resistance, to ensure the continuity and durability of the shaping component. Beneficial effects of the invention

[0039] Hands-free shoes with the shaping component of this invention have the following excellent effects.

[0040] 1. Maintaining Aesthetic Appearance and Contour: The shaping component of this invention has a smooth rear profile that slopes or extends in a straight line in a single direction, with a gradually thinning blade-like shape at the edge. This design allows the shaping component to be fully embedded between the upper and lining materials, avoiding the problems of backward curling or exposed component contours present in conventional technologies. As a result, the smooth and refined upper of the hands-free shoe, as well as its crisp appearance, are maintained.

[0041] 2. Balancing tool-free on / off functionality with reliable heel retention: This invention integrates the on / off guidance function of the inclined "slide-in section" with the heel wrapping / positioning function of the "protrusion" and "extension" protruding inwards into the shoe into a composite curved shape. This allows for smooth on / off while naturally guiding the foot, and a close fit to the heel after wearing, preventing shifting or slipping during walking. It achieves a high level of simultaneous balance between the traditionally trade-off functions of "ease of on / off" and "stability maintenance."

[0042] 3. Excellent support, shape retention, and durability: An optimized thickness distribution, with the thickest "protrusion" of the shaping component gradually thinning towards the edges through the center of the "support section," and a "T-shaped support keel" structure, provides high support rigidity and shape retention for the entire heel counter. This effectively prevents indentation and deformation of the heel counter caused by repeated stepping and long-term use. Furthermore, by using highly elastic and fatigue-resistant resins such as TPU as the integral molding material, it achieves superior durability against aging and load deformation compared to traditional shaping materials such as chemical sheets and hot melt adhesives.

[0043] 4. Simplified manufacturing process and improved versatility: The shaping components are fixed to the top of the heel counter via simple stitching, significantly reducing complex gluing or wrapping processes. Furthermore, the "hollow structure" extension design improves adaptability to various shoe lasts of different sizes and shapes, offering excellent versatility in shoemaking. This allows for cost-effective mass production while maintaining aesthetic quality.

[0044] 5. Applicable to a wide range of footwear: The technology of this invention, with its core "non-impairing embedded structure" and "integrated functionality," is not limited to dress shoes, but is also widely applicable to athletic shoes, casual shoes, and other footwear that emphasize overall appearance and design. Thus, it is possible to balance hands-free functionality with excellent aesthetic quality across a diverse product line. Brief description of the attached figures

[0045] To clearly illustrate the technical solutions of the embodiments of the present invention, the following description is provided in conjunction with the accompanying drawings. The accompanying drawings in the following description are some embodiments of the present invention, and those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0046] Figure 1 This is a schematic diagram of the hands-free shoe structure according to an embodiment of the present invention.

[0047] Figure 2 This is a side cross-sectional view of a shaping component according to an embodiment of the present invention.

[0048] Figure 3 This is a plan view of a shaping component according to an embodiment of the present invention.

[0049] Figure 4 This is a side cross-sectional view of a shaping component according to an embodiment of the present invention.

[0050] Figure 5 This is a bottom view of a shaping component according to an embodiment of the present invention.

[0051] Figure 6 The sliding portion of the shaping component in one embodiment of the present invention is along Figure 2 Cross-sectional view along the A1-A2 direction.

[0052] Figure 7 The support portion of the shaping component in one embodiment of the present invention is along Figure 2 Cross-sectional view along the B1-B2 direction.

[0053] Figure 8 This is a side cross-sectional view of the heel counter of a shoe according to an embodiment of the present invention.

[0054] Figure 9 This is a front view of a shaping component according to an embodiment of the present invention, wherein the dashed line indicates the approximate area of ​​the T-shaped support keel.

[0055] Figure 10 This is a schematic diagram comparing the width of the shoe opening and the heel according to an embodiment of the present invention. The dotted line represents the heel. a shows that the shoe opening of the shoe is polygonal, and b shows that the shoe opening of the shoe is curved.

[0056] The symbols in the diagram represent: hands-free shoe-1, heel counter-10, top of heel counter-11, raised structure-12, upper material-20, lining material-30, cushioning component-40, shaping component-100, slip-in part-101, support part-102, protrusion part-103, extension part-104, side wing-105, supporting keel-106, stitching part-107, hollow structure-108, shaping material-200. Detailed Implementation

[0057] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0058] The following is for reference Figures 1 to 10 The embodiments of the present invention are described below.

[0059] like Figure 1 As shown, an embodiment of the present invention provides a hands-free shoe including a shaping component 100, which comprises: a heel counter 10 of the hands-free shoe, and a shaping component 100 disposed between the upper material 20 and the lining material 30 of the heel counter 10.

[0060] The shaping component 100 is integrally molded from resin material using an alloy mold. In this embodiment, the shaping component 100 is made of TPU, which has both support and elasticity, possessing excellent support and flexibility. That is, while ensuring that the shape of the heel counter maintains the required support rigidity, it also has the flexibility to adapt to various shoe last sizes, balancing structural stability and adaptability, and also possessing advantages such as abrasion resistance, durability, and high-temperature resistance, ensuring the continuity and durability of the shaping component 100. In this embodiment, TPU with a Shore A hardness of 80-90 is preferred.

[0061] In embodiments of the present invention, such as Figure 2 As shown, the shaping component 100 includes a sliding portion 101, a support portion 102, and an extension portion 104. The sliding portion 101 is inclined backwards towards the foot, and as shown... Figure 3 As shown, the sides of the sliding part 101 are arc-shaped and tilt downwards, forming a guide structure that allows the heel to slide smoothly into the shoe.

[0062] Preferably, the tilt angle of the sliding part 101 is set to 25 to 50 degrees to optimize the heel sliding in effect. The tilt angle of the sliding part 101 can be set in the range of 20 to 60 degrees, but for varieties such as business shoes that require quick on and off, 30 to 60 degrees is preferred.

[0063] In other embodiments of the invention, such as Figure 4 As shown, the inner and outer sides of the sliding part 101 can extend diagonally forward towards the toe of the shoe, forming two side wings 105.

[0064] In this configuration, the two side wings 105 are integrally formed with the slide-in portion 101, and their thickness can be a tapered shape that gradually thins from the slide-in portion 101 towards the tip of the side wing 105. The extension direction of each side wing 105 has a downward and forward tilt angle when viewed from the side of the shoe, and when viewed from above, the outer side wing 105a is configured to be obliquely forward and outward, and the inner side wing 105b is configured to be obliquely forward and inward.

[0065] Preferably, the acute angle at which the extended lines of the two side wings 105 intersect is in the range of 30 to 60 degrees. This angle range is optimized to ensure that the side wings 105 have sufficient support area within the structure of the heel counter 10, while also providing effective reinforcement and guidance.

[0066] Preferably, the length of the side wing 105 is such that it does not reach the inner or outer ankle. Furthermore, from the perspective of the "inconspicuous structure" and "consistent appearance" of hands-free shoes, its upper edge is beveled and its lower edge is blade-shaped, in order to avoid discomfort to the foot and prevent the silhouette from emerging from the upper material 20.

[0067] The side wing 105 has a generally straight shape or a slightly convex curve on the outside, forming a three-dimensional structure relative to the front-back and inside-out directions of the heel counter 10. Thus, the shaping component 100 constitutes a three-dimensional support frame that wraps around the heel counter 10 from the side and oblique front, suppressing lateral rolling or rotation of the heel during wear.

[0068] Thus, the shaping component 100, through the sliding part 101 and a pair of side wings 105 extending therefrom, achieves the combined functions of guiding the heel insertion and stabilizing the heel from multiple directions during wearing.

[0069] In other embodiments of the invention, such as Figure 2 As shown, a protrusion 103 protruding towards the toe is formed below the inclined portion of the slide-in portion 101. Referring to the vertical lines in the figure, at least a portion of the protrusion 103 protrudes towards the toe relative to other parts of the shaping member 100.

[0070] This protrusion 103 serves as a stop to prevent the heel from easily slipping out of the shoe along the sliding part 101.

[0071] Preferably, the contact surface between the protrusion 103 and the heel is a smooth curved shape that conforms to the contour of the upper rear side of the heel, does not hinder the movement of the heel when putting on or taking off the foot, and fits tightly when kept in place.

[0072] In other embodiments of the invention, such as Figure 2 As shown, starting from below the protrusion 103 and moving downwards along the contour line of the heel, the support portion 102 and the extension portion 104 are connected and extended in an arc.

[0073] Extension section 104 Figure 2 As shown, it bulges backward, and as Figure 5 As shown, its two sides are arc-shaped and tilt upwards, forming a shape that fits the heel.

[0074] The thickness begins to decrease from the lower part of the support portion 102, and continues to decrease through the extension portion 104 until the edge end of the extension portion 104, forming an end that can be drawn with a line, i.e., a blade shape.

[0075] The protrusion 103, support 102, and extension 104 are integrally and continuously formed, making the force transmission path clear and efficiently distributing and bearing multi-directional loads from the heel. In particular, the edge of the extension 104 has an "end that can be drawn with a line", which can prevent stress concentration and reduce the risk of cracks or damage.

[0076] When the hands-free shoes are worn, the protrusion 103, support 102, and extension 104 form a shape that conforms to the heel. The curved shape that conforms to the contour of the heel bone and the matching three-dimensional shape distribute the pressure points on the heel, reducing local load or deformation. As a result, comfort can be maintained even after long-term wear.

[0077] Furthermore, the support portion 102 and the extension portion 104 can be integrally formed with the sliding portion 101 and the two side wings 105, and may include structures for reinforcing the fixing component 100 inside the heel counter 10 of the hands-free shoe, as well as for connecting to the midsole or outsole. Thus, the fixing component 100 can function as a sturdy one-piece frame that wraps around the heel, contributing to the overall structural stability and durability of the hands-free shoe.

[0078] In other embodiments of the invention, such as Figure 4 As shown, the rear side of the shaping component 100 does not have obvious concave or convex shapes, and its rear contour line is smooth. Furthermore, the rear contour line of the shaping component 100 from the top to the bottom is inclined in one direction or extends in a roughly straight line, thereby striving for a simple appearance of the component and not compromising the aesthetic appearance of the hands-free shoe.

[0079] Furthermore, such as Figure 4As shown, the thickness of the protrusion 103 is the thickest compared to other parts of the shaping component 100. This thickness continues continuously and gradually thins through the support portion 102 until the edge of the extension portion 104, forming a substantial edge shape at the edge of the extension portion 104, i.e., forming a blade-like end that can be drawn with a line. This gradually thinning thickness design ensures structural strength, and this simple yet robust three-dimensional shape can be applied to a variety of shoemaking methods.

[0080] In other embodiments of the invention, the lower portion of the extension 104 is the thinnest, allowing it to be easily inserted into the gap between the shoe last and the sole mold 10 during the injection molding process. This closes the mold and applies sufficient clamping force, preventing material leakage during the sole material injection molding process. Therefore, at least the lower portion of the extension 104 should have the thickness required for the shoe last and sole mold to close during the injection molding process.

[0081] Furthermore, such as Figure 6 As shown, the thickness of the protrusion 103 gradually decreases from its central part to the inner and outer edges, conforming to the natural shape of the heel and fitting the heel, while reducing unnecessary outlines on the surface of the hands-free shoe.

[0082] Furthermore, such as Figure 7 As shown, the central area of ​​the support portion 102 has the greatest thickness, which gradually decreases towards the inner and outer edges. This design provides sufficient support rigidity to the central area of ​​the heel counter 10 that directly bears the load, while providing moderate softness to the sides, thus optimizing the balance between comfort and structural strength.

[0083] Furthermore, such as Figure 9 As shown, the maximum thickness region of the protrusion 103 is connected to the central thickness region of the support 102, forming a T-shaped support rib 106 within the shaping component 100. In this support rib 106, the protrusion 103 forms a T-shaped transverse section, conforming to the upper rear side of the heel to enhance its support function as a stopper. On the other hand, the central region of the support 102 forms a T-shaped longitudinal section, strengthening the shape retention of the entire heel counter 10 and effectively preventing the upper material 20 or lining material 30 from denting and deforming due to repeated pressure. The thickness of the support rib 106, considering optimal support performance and lightweight design, is controlled within the range of 5mm to 15mm. Furthermore, as... Figure 6 and Figure 7 As shown in the cross-sectional view of the supporting keel 106, the curve of its outer arc-shaped edge is smooth, and its curvature is smaller than that of the arched curve of the inner arc-shaped edge. This design maintains an inconspicuous and simple outline in appearance, while ensuring sufficient support space and strength on the inner side to conform to the shape of the heel bone, thus highly balancing functionality and design.

[0084] In embodiments of the present invention, the supporting force of the thicker supporting keel 106 is combined with the flexibility of the thinner extension portion 104, thereby giving the heel counter height shape retention and moderate softness, taking into account both the structural stability of the hands-free shoe during long-term use and its adaptability in shoemaking.

[0085] In other embodiments of the invention, the lining material 30 covering the protrusion 103 bulges towards the toe, forming a raised structure 12. For example... Figure 8 As shown, the most prominent point of this raised structure 12 in the direction of the toe is most prominent in the direction of the toe (front).

[0086] In other embodiments of the invention, such as Figure 8 As shown, a cushioning component 40, such as a shrinkable sponge, is installed between the shoe lining material 30 and the shaping component 100. When the heel slides diagonally forward and downward along the sliding surface of the sliding part 101 and reaches the most prominent point of the protrusion 103, the cushioning component 40 is compressed and thins. With the help of inertia and the elasticity of the shoe upper material 20, the heel can smoothly pass through the most prominent point of the protrusion 103 and slide into the shoe. After the heel enters the shoe, the cushioning component 40 and the shoe upper material 20 quickly return to their original shape. Through the stopping effect of the protrusion 103, the heel counter 10 tightly wraps around the heel, making it difficult for the heel to fall off.

[0087] As an alternative embodiment of the present invention, when the heel slides diagonally forward and downward along the sliding surface and reaches the most prominent point of the protrusion 103, the heel may not be able to smoothly enter due to the obstruction of the protrusion 103. In this case, by providing a telescopic structure at the opening of the hands-free shoe, the tension generated by the foot insertion can be used to widen the shoe opening. After the foot enters the hands-free shoe, the telescopic structure elastically recovers, thereby enabling the protrusion 103 to precisely position the heel.

[0088] In other embodiments of the invention, such as Figure 9 As shown, the extension 104 has a retractable or expandable hollow structure 108 (notch) with a maximum retractability of 15mm. This design allows it to accommodate heel shapes of various shoe last sizes ranging from size 34 to size 46.

[0089] Furthermore, when worn, this stretchable hollow structure 108 works in conjunction with the protrusion 103 and side wings 105 to tightly wrap around the heel in the entire circumference, significantly improving the fit and stability. Of course, one or more hollow structures 108 can be provided as needed.

[0090] In other embodiments of the invention, the shaping component 100 further includes structures for securing it to the heel counter 10. For example... Figure 9As shown, a sewing part 107 for fixing to the top of the heel counter 10 of the hands-free shoe is provided on the upper part of the shaping part 100 and in the center part in the left-right direction.

[0091] Preferably, the horizontal width of the sewn part 107 is 0.5 cm or more, and its thickness is about 0.05 cm. This size setting ensures that it has sufficient strength and ease of operation as a seam, while preventing the seam from appearing bulky and causing discomfort or bulges inside the hands-free shoe.

[0092] Furthermore, the sewing section 107 is a thin plate-like shape that extends smoothly and continuously from the body of the shaping component 100. As a result, the needle can easily pass through during the sewing process, and by reducing stress concentration at the needle eye, the risk of the seam unraveling or the component itself breaking due to long-term use is reduced.

[0093] With this configuration, the shaping component 100 can be reliably and durablely fixed to the heel counter 10 of the shoe. As a result, the shaping component 100 will not shift or deform during walking or exercise, and can continuously support the heel counter.

[0094] In other embodiments of the present invention, the horizontal width of the sliding portion 101 in the left-right direction is smaller than the horizontal width of the human heel. In this embodiment, considering both support and aesthetics, the width of the sliding portion 101 is preferably 3 to 4.5 cm, and the thickness is preferably 0.15 to 0.25 cm.

[0095] Furthermore, in order to limit the height of the heel counter 10, in this embodiment of the invention, the height of the slip-in portion 101 is set to less than half the height of the extension portion 104, preferably in the range of one-third to one-half. This proportional relationship gives the shaping component 100 and even the entire hands-free shoe a low and stable visual and physical impression.

[0096] Furthermore, the aforementioned height ratio can be adjusted according to the type of hands-free shoe (e.g., athletic shoes, business shoes, etc.) or design, within a range that does not impair the insertion guide function of the slide-in portion 101 and ensures sufficient support area for the extension portion 104.

[0097] This design achieves a balance between reducing the excessive protrusion of the heel, creating a clean and crisp silhouette for hands-free shoes, and enhancing practical stability during wear, thus combining design and functionality.

[0098] When the hands-free shoe is worn, at least a portion of the protrusion 103 surrounds the lower part of the Achilles tendon and the back of the heel. Thus, the protrusion 103, the support portion 102, and the extension portion 104 work together to three-dimensionally wrap the heel, forming an integrated retaining structure.

[0099] This design evenly supports and wraps around the entire heel, including the area around the base of the Achilles tendon, to provide support against the multidirectional forces applied to the heel during walking or exercise, especially the downward pulling force. As a result, it effectively prevents hands-free shoes from accidentally slipping off or shifting excessively, significantly improving dynamic stability.

[0100] Furthermore, the inner surface of the protrusion 103 that contacts the Achilles tendon is a smooth curved surface to reduce pressure or friction on the skin, and its curvature is set within the limit that does not hinder the range of motion of the foot joint when standing and walking.

[0101] In other embodiments of the invention, such as Figure 9 As shown, the upper part of the shaping component 100 is arc-shaped, and the two sides of its upper part gradually extend downward from the sliding part 101 to the extension part 104.

[0102] The downward-sloping shape creates a path that efficiently disperses and transmits the upward insertion force borne by the sliding part 101 and the impact force borne by the heel upon landing to the extended part 104, which has a larger area. This optimized force transmission structure effectively controls the bending or deformation of the component itself, improving durability.

[0103] From the viewpoint of further optimizing the overall stability of the shaping component 100 and the support performance of the sliding portion 101, it is preferable to set the width of the extension portion 104 to approximately 1.5 times the width of the sliding portion 101.

[0104] This 1:1.5 width ratio allows the extension 104 to have sufficient expansion relative to the sliding part 101, thereby extending the support of the heel counter 10 to the side and improving stability upon landing.

[0105] Furthermore, the aforementioned width ratio can be adjusted within the range of 1.2 to 1.8 times depending on the type of hands-free shoes (running shoes, business shoes, etc.) or the required support rigidity. This ensures flexibility in application to diverse product designs.

[0106] In traditional methods of shaping the heel counter 10 of hands-free shoes, to maintain the appearance and aesthetics of the shoe body, a shaping material 200, such as a chemical sheet or hot melt adhesive, is typically installed inside the heel counter 10. Specifically, the chemical sheet is softened by a solvent and shaped into a predetermined form, then dried and hardened on the shoe manufacturing production line. On the other hand, the hot melt adhesive is softened by heating on the shoe manufacturing production line, shaped in the same way, and then cooled to maintain the shape of the heel counter 10 of the shoe last. Both materials need to be fixed between the upper material 20 and the lining material 30 during the upper manufacturing process. In this process, the upper material 20 and the lining material 30 are first sewn together with their right sides facing each other at the shoe opening, and then turned inside out along the seam, a process known as the "uppercase turning process." After turning inside out, the shaping material 200 is inserted and positioned between the upper material 20 and the lining material 30.

[0107] In other embodiments of the invention, firstly, the upper material 20 and the lining material 30 are sewn together with their right sides facing each other at the shoe opening. During this sewing, the shaping component 100 is positioned inside the lining material 30, and its sewing portion 107 is simultaneously sewn into the seam allowance of both the upper material 20 and the lining material 30. Subsequently, the entire assembly is turned inside out along the seam (uppercase turning process). Thus, the shaping component 100 is securely positioned between the lining material 30 and the upper material 20, with the concave surface of its extension 104 conforming to the lining material 30 and the bulging portion conforming to the upper material 20. This method eliminates the need for conventional pretreatment processes such as spraying adhesives, simplifying the operation and shortening the process.

[0108] Furthermore, after the upper is folded, the shaping material 200 is inserted between the upper material 20 and the lining material 30. Preferably, this shaping material 200 is positioned on the back of the shaping component 100 (on the side of the upper material 20). This prepares the material for a robust support structure in which the shaping component 100 and the shaping material 200 form an integral part in subsequent processes.

[0109] Furthermore, at the lower part of the heel counter, the upper material 20, the lower end of the extension 104 of the shaping component 100, the shaping material 200, and the lining material 30 are overlapped and sewn together to form the upper. This sewing aligns the edges of all components, facilitating accurate installation of the midsole and other components in subsequent processes. After sewing, any excess portion of the extension 104 beyond the edge trim is trimmed off.

[0110] Furthermore, in the final molding process of the hands-free shoe (heated and pressurized molding using hot melt adhesive, etc.), the adhesive shaping material 200 softens and firmly adheres to and solidifies on the back of the shaping component 100. Thus, the two form an integrated structure, improving the support rigidity and shape retention of the heel counter 10.

[0111] Through this series of processes, hands-free shoes that combine excellent structural performance and aesthetic appeal can be manufactured without excessive processing.

[0112] In an embodiment of the present invention, the shoe body manufactured by the process of the present invention is as follows: Figure 1 and Figure 8 As shown, the top 11 of the heel counter 10 extends backward and upward, expanding the foot-accommodating space at the shoe opening and facilitating foot insertion. At this time, the lining material 30 of the top 11 of the heel counter forms a slide-shaped curved surface that slopes inward, and the upper part of the lining material 30 extends upward to cover the top 11 of the heel counter and overlaps with its top outline.

[0113] Furthermore, inside the shoe, the protrusion 103 and the filling material form a raised structure 12 on the inside of the heel counter 10, which fits the heel when wearing the hands-free shoes, making the hands-free shoes less likely to fall off.

[0114] In other embodiments of the invention, a cushioning structure may be added to enhance foot comfort. Specifically, a soft cushioning component 40, such as sponge or foam, is bonded or composited to the back of the lining material 30 on the inside of the hands-free shoe. This softens the heel contact surface, helping to absorb impact upon landing and reduce daily pressure.

[0115] In other embodiments of the invention, a cushioning filler or soft pad is applied to the foot contact surface of the shaping member 100 (particularly the sliding portion 101 or the protrusion 103). This softens the tactile sensation of the portion in direct contact with the foot while maintaining the structural support function of the shaping member 100, preventing pressure concentration in specific areas.

[0116] Through these cushioning treatments, the hands-free shoes of this invention not only provide excellent retention / support but also offer comfort for extended wear. Furthermore, two cushioning techniques can be used in combination as needed to achieve optimal shock absorption and a snug fit.

[0117] In other embodiments of the present invention, a design with the following structural adaptability is adopted to accommodate multiple shoe sizes.

[0118] The shaping materials 200, such as chemical sheets or hot melt adhesives, used are adjusted in size according to the shoe size. On the other hand, although the shaping component 100 is reliably fixed to the top 11 of the heel counter by the sewing part 107, the lower end of its extension 104 sometimes does not reach the foot position.

[0119] like Figure 8As shown, this design ensures that the extension 104 of the shaping component 100 does not reach the height of the heel counter 10, creating a "suspended state" that is independently supported relative to the upper material 20 and the lining material 30. In this state, after determining and adjusting the tilt angle and position of the shaping component 100 using predetermined positioning tools or marks (positioning points), the shaping material 200 is heated and pressurized for molding (shaping and shaping). As a result, the softened shaping material 200 completely conforms to the shape of the back of the shaping component 100, and after cooling and solidification, the two form a robust integrated structure, thus achieving further extension of the extension 104. It is even better to sew the lower part of the extension 104 to the shaping material 200 beforehand. This solves the problem that the shaping component 100, due to its fixed height, is difficult to adapt to heel counters 10 of different heights.

[0120] Furthermore, even in a "suspended state", positioning and angle confirmation can prevent the position of the shaping component 100 from shifting or tilting excessively during molding, ensuring complete and uniform adhesion with the shaping material 200.

[0121] Ultimately, through the integration with the shaping material 200, the overall support rigidity and shape retention performance of the heel counter 10 can be achieved. Therefore, this embodiment achieves a high degree of adaptability to diverse shoe sizes and designs while pursuing component standardization and manufacturing efficiency.

[0122] In other embodiments of the invention, such as Figure 8 As shown, the foot-facing surface of the sliding part 101 of the shaping component 100 is designed to slope backward and upward. This sliding part 101 functions as a structure supporting the top of the heel counter 11, therefore the foot-facing surface of the top of the heel counter 11 also slopes backward and upward. This design increases the foot-accommodating space at the shoe opening, making it easier to put on and take off.

[0123] At the same time, the width of the sliding part 101 of the shaping component 100 is intentionally set to be narrower. Therefore, the width of the shoe opening of the heel counter 10 is also smaller than the width of the human heel in the horizontal direction (anatomical width). This dimensional relationship allows the shoe opening to spring back and tightly wrap around the heel after the foot is inserted.

[0124] As a specific shape, such as Figure 10 As shown, the radius of curvature of the shape formed inside the hands-free shoe opening is designed to be smaller than the natural radius of curvature of the human heel, and its interior angle is smaller than the anatomical angle of the human heel. The dotted line in the figure represents the heel. In the figure, a is the shape of the shoe opening with a polygonal shape, and b is the shape of the shoe opening with a curved shape.

[0125] This design, through the narrow design of the slip-in section 101 and the optimization of its radius of curvature or inner angle, allows the shoe opening to tighten appropriately after the foot is inserted to wrap around the heel. This improves the stability of the fit and the anti-slip performance. Furthermore, the slip-in section 101 functions as a frame supporting the upper part, maintaining the shape of the heel counter 10 even under repeated putting on and taking off or load.

[0126] In other embodiments of the invention, the upper part of the sliding portion 101 is inclined rearward, and the two sides are arc-shaped and inclined forward, forming a sliding platform for the heel to slide into the shoe. This design allows the heel to slide smoothly into the shoe, avoiding friction or obstruction between the heel and the heel counter 10, thus improving the smoothness and comfort of wearing the shoe.

[0127] In other embodiments of the present invention, the shaping component 100 is made of a polymer material, such as resin or plastic, that has a certain supporting strength and flexibility. For material selection, TPU (polyurethane), TPE (thermoplastic elastomer), or TPEE (thermoplastic polyester elastomer) are recommended. These materials have good resilience and toughness, provide sufficient support, and also possess advantages such as abrasion resistance, durability, and high-temperature resistance. Therefore, the shaping component 100 made of these materials can effectively meet the structural requirements of hands-free shoes while ensuring comfort and durability during wear.

[0128] In other embodiments of the present invention, the shaping component 100 is integrally formed using a metal mold through injection molding. The metal mold is made of 738H mold steel, which is characterized by its resistance to damage, aging, and deformation, resulting in a long service life and reduced maintenance costs. This means that frequent mold replacement or maintenance is unnecessary during production, further reducing production costs.

[0129] In other embodiments of the present invention, the shaping component 100 may also be made of a shaping material 200 such as a chemical sheet or hot melt adhesive, achieving the same hands-free wearing effect. Specifically, the shaping component 100 of the aforementioned material is first installed on the top 11 of the heel counter by sewing or bonding, and then sandwiched together with the conventional shaping material 200 between the upper material 20 and the lining material 30 for molding. Although the shaping component 100 manufactured in this way is not as durable as TPU, it is suitable for short-life hands-free shoes (e.g., activity shoes intended for temporary use or hands-free shoes expected to be used for a short period of time).

[0130] In other embodiments of the invention, when a person puts on the shoes, inserts their toes into the shoes and steps down on their heels, causing the heels to slide into the shoes along the lining material 30 covering the top 11 of the heel counter. After the heels are inside the shoes, the raised structure 12 conforms to the heels, making it difficult for the heels to slip off.

[0131] In other embodiments of the invention, the shaping component 100 includes a center position mark corresponding to the center position of the heel counter 10. The center position mark can be visually or tactilely identified during the manufacturing process, thereby accurately aligning the shaping component 100 with the center position of the heel counter 10. The position mark employs a raised / recessed geometric structure to form a clear positioning identifier. Its shape is circular or linear, with a diameter of 1 mm and a height or depth of 0.5 mm, making it both identifiable and preventing foot discomfort.

[0132] In other embodiments of the invention, a fine texture is applied to the surface of the shaping component 100. These textures have a depth of less than 0.5 mm and can be linear, mesh-like, dotted, matte, brushed, wavy, speckled, uneven, spiral, granular, etc. These textures are distributed on the surface of the shaping component 100 to increase the contact area and adhesion with the shaping material 200.

[0133] In other embodiments of the present invention, the shaping component 100 is applicable to various shoemaking processes such as adhesive bonding, sewing, pressing, injection molding, vulcanization, Goodyear welt construction, and California welt construction. These can be selected based on material properties, production equipment adaptability, and differences in the production environment to ensure that the structure formed by the shaping component 100 and the shaping material 200 can be effectively fixed inside the heel counter 10, giving the hands-free shoe the required performance and stability.

Claims

1. A hands-free shoe, characterized in that: This includes the heel counter of a shoe with a shaped component consisting of multiple curved surfaces with different radii of curvature; The shaping component is integrally molded from resin material using an alloy mold, combining support and flexibility; The shaping component includes a sliding part, a support part, an extension part, and a protrusion that protrudes towards the toe of the shoe; In the front view, the upper part of the shaping component is arc-shaped, and the two sides of its upper part gradually extend downwards at an angle from the sliding part to the extension part; In the side view, the sliding part is inclined diagonally backward toward the foot, and in the top view, its two sides are arc-shaped and inclined downward, thereby forming a guide structure for guiding the heel into the shoe. In the side view, the protrusion, the support, and the extension form a shape that conforms to the heel; At least a portion of the protrusion is the thickest of the other parts of the shaping component; In the side view, at least a portion of the protrusion protrudes towards the toe relative to other parts of the shaping component; The extension gradually thins from the support portion to the edge of the extension portion, and at least a portion of the extension portion has a thickness that enables the last and sole mold to be sealed together in the injection molding process. When a user puts on the shoes, the heel slides into the heel counter along the sloping sliding part, and the protrusion fits the heel, making the shoes less likely to fall off.

2. The hands-free shoes according to claim 1, characterized in that: The shaping component is integrated and reinforced through shaping materials.

3. The hands-free shoes according to claim 1, characterized in that: The upper end of the shaping component is provided with a sewing part, which is a structure for fixing the shaping component to the heel of the shoe.

4. A hands-free shoe, characterized in that: This includes the heel counter of a shoe with a shaped component consisting of multiple curved surfaces with different radii of curvature; The shaping component is integrally molded from resin material using an alloy mold, combining support and flexibility; The shaping component includes a sliding part, a support part, an extension part, and a protrusion that protrudes towards the toe. In the side view, the sliding part is inclined diagonally backward toward the foot, and in the top view, its two sides are arc-shaped and inclined downward, thereby forming a guide structure for guiding the heel into the shoe. In the side view, the protrusion, the support, and the extension form a shape that conforms to the heel; In the side sectional view, the rear side of the shaping component has no obvious concave or convex shape, its rear contour line is smooth, and it is inclined or extends in a roughly straight line from the top to the bottom in a single direction. At least a portion of the protrusion is the thickest of the other parts of the shaping component, and in a side view, at least a portion of it protrudes most towards the toe relative to the other parts of the shaping component. The thickness of the protrusion gradually decreases from the support portion toward the end of the edge of the extension portion; When installed in the shoe, the protrusion forms a raised structure on the shoe lining material to fit the heel and prevent the shoe from falling off.

5. A hands-free shoe according to claim 4, characterized in that: The inner and outer sides of the sliding part extend diagonally forward of the shoe to form two side wings, and the angle at which the extension lines of the two side wings intersect is an acute angle.

6. A hands-free shoe according to claim 4, characterized in that: The protrusion and the central area of ​​the support form a relatively thick T-shaped support keel. The protrusion forms the transverse section of the T-shape, and the central region of the support forms the longitudinal section of the T-shape.

7. A hands-free shoe, characterized in that: Including the heel counter with shaping components; The shaping component includes a sliding part for guiding the heel into the shoe, a protrusion for preventing the heel from slipping out, a support part, and an extension part; The horizontal width of the sliding part in the left and right directions is smaller than the horizontal width of the human heel; The lining material at the top of the heel counter forms a slide-shaped curved surface that slopes inwards into the shoe, and the upper part of the lining material extends upwards to cover the top of the heel counter. The width of the shoe opening at the heel counter is set to be less than the width of the human heel in the horizontal direction, and the radius of curvature of the shape formed by the shoe opening inside the shoe is set to be less than the natural radius of curvature of the human heel. The shoe lining material covering the protrusion rises towards the toe to form a protrusion. In the side cross-sectional view, the most protruding point of the protrusion in the direction of the toe is the most prominent in the direction of the toe. Furthermore, at least a portion of the extension has a thin wall thickness required to achieve the injection molding process.

8. A hands-free shoe according to claim 7, characterized in that: The extension has one or more hollow structures to accommodate various shoe last sizes.

9. A hands-free shoe according to claim 7, characterized in that: The hands-free shoes are manufactured using an injection molding process.

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