Multi-density arcuate sole

Abstract

The utility model relates to the field of shoe manufacturing, especially a multi-density arc-shaped shoe sole, the shoe sole includes upper shoe sole, lower shoe sole and rear shoe sole. The upper shoe sole bottom surface is equipped with the first arc-shaped connecting surface. The lower shoe sole upper surface is equipped with the first connecting groove, and the rear end bottom surface is equipped with the second arc-shaped connecting surface. The utility model shoe sole is composed of upper shoe sole, lower shoe sole and rear shoe sole three parts, respectively adopt different density material - the upper shoe sole selects the density configuration of relatively soft, promotes the foot adhesion and comfort degree, the lower shoe sole adopts the medium density, and the elasticity and supporting property of arch area are considered, and the rear shoe sole adopts higher density, and the supporting property and impact absorption capacity of heel area are strengthened, through the differentiation design of material density, the scientific proportion of the thickness of each part is combined, makes the shoe sole form accurate matching mechanical response gradient in the key stress area such as toe, arch, heel, realizes the best elastic feedback and supporting performance, thereby perfect matching human motion mechanics demand, improves the comfort degree.

Description

Technical Field

[0001] This utility model relates to the field of shoe manufacturing, and in particular to a multi-density arc-shaped shoe sole. Background Technology

[0002] With the increasing health awareness and diversified sports needs, footwear products are facing higher and higher requirements for comfort, functionality and safety. As the core component of footwear, the structural design and material selection of the sole directly affect the wearing experience and sports performance.

[0003] Currently, most shoe soles on the market use a single material or a single density design. While this can meet basic wearing needs, it is difficult to take into account the biomechanical characteristics of different areas of the foot. The toe area needs good elasticity to adapt to the push-off action, the arch area needs moderate support to maintain foot stability, and the heel area needs excellent cushioning performance to absorb the impact of landing. This "one-size-fits-all" design makes it difficult for the sole to achieve a precise balance between elasticity, support, and cushioning, which can easily lead to foot fatigue, soreness, and even injury after prolonged wear. Summary of the Invention

[0004] In view of the shortcomings mentioned above, this utility model provides a multi-density arc-shaped shoe sole.

[0005] The present invention adopts the following technical solution:

[0006] A multi-density arc-shaped shoe sole, characterized in that the shoe sole comprises:

[0007] The upper sole has an inwardly recessed edge at the bottom surface to form a first arc-shaped connecting surface;

[0008] The lower sole has a first connecting groove on its upper surface that covers the middle of the front of the first arc-shaped connecting surface, and the rear bottom edge is recessed inward to form a second arc-shaped connecting surface;

[0009] The rear sole has a second connecting groove covering the second arc-shaped connecting surface and a third connecting groove covering the rear end of the first arc-shaped connecting surface on its upper surface.

[0010] Anti-torsion plate, the upper shoe sole is embedded with the anti-torsion plate;

[0011] The upper sole, lower sole, and rear sole are made of materials with different densities. The upper sole is placed on the lower sole and rear sole. The front end of the lower sole and the rear end of the rear sole curve upwards to form an arc shape.

[0012] As a further improvement, the second connecting groove is provided with a step, the upper surface of the step is recessed inward to form the third connecting groove, and the rear end of the lower shoe sole is provided with a smooth connecting surface that abuts against the side of the step.

[0013] As a further improvement, both the bottom and the rear sole are equipped with anti-slip pads.

[0014] As a further improvement, the anti-slip mat is made of an elastic material.

[0015] As a further improvement, the upper surface of the shoe sole is provided with an inwardly recessed mounting groove, and the anti-torsion plate is embedded in the mounting groove.

[0016] As can be seen from the above description of the structure of this utility model, compared with the prior art, this utility model has the following advantages: The sole is composed of three parts: an upper sole, a lower sole, and a heel sole, each made of a material with a different density. The upper sole uses a relatively soft density configuration to improve the fit and comfort of the foot. The lower sole uses a medium density to balance the elasticity and support of the arch area. The heel sole uses a higher density to enhance the support and impact absorption capacity of the heel area. Through the differentiated design of material density, combined with the scientific ratio of the thickness of each part, the sole forms a precisely matched mechanical response gradient in key stress areas such as the toe, arch, and heel, achieving the best elastic feedback and support performance, thereby perfectly matching the biomechanical needs of human movement and improving comfort. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0018] Figure 2 This is a front view structural diagram of the present invention.

[0019] Figure 3 This is an exploded structural diagram of the present invention.

[0020] Figure 4 This is a comparison diagram showing the usage states of wearing traditional shoe soles and wearing the shoe sole of this utility model. Detailed Implementation

[0021] The specific embodiments of this utility model are described below with reference to the accompanying drawings.

[0022] As attached Figure 1As shown, a multi-density arc-shaped sole is composed of three parts: an upper sole 11, a lower sole 12, and a heel sole 13. Each part is carefully made of materials with different densities. This differentiated material density design is specifically developed based on the stress characteristics of different areas of the human foot during movement. By precisely controlling the density parameters of the upper sole 11, lower sole 12, and heel sole 13, and combining the scientific ratio of the thickness of each part, the sole forms a precisely matched mechanical response gradient in key stress areas such as the toe, arch, and heel through the synergistic design of density and thickness. When the foot performs actions such as pushing off, supporting, and landing, each part can automatically adjust the degree of deformation according to the magnitude of the force, which not only ensures the energy feedback efficiency during exercise but also minimizes the risk of sports injuries, thus achieving a perfect fit with human biomechanics.

[0023] Among them, as attached Figure 1 and Figure 3 As shown, the upper sole 11, as the part that directly contacts the foot, uses a relatively soft density configuration and preferably ultra-soft PU memory foam material to improve foot fit and comfort. Its bottom edge is treated with an inwardly concave process, forming a smooth first arc-shaped connecting surface 111. This first arc-shaped connecting surface 111 not only provides a precise positioning basis for the combination of the upper sole 11 and the lower sole 12, but also, through the mechanical transmission characteristics of the arc-shaped surface, evenly distributes the pressure generated during foot movement to the entire sole, effectively reducing local pressure and minimizing exercise fatigue.

[0024] As attached Figure 1 and Figure 3 As shown, to further enhance the overall stability and torsional performance of the shoe and meet the foot protection needs in light sports scenarios, a specially designed anti-torsion plate 15 is embedded inside the upper sole 11. This anti-torsion plate 15 can be made of high-strength carbon fiber composite material with a certain degree of toughness, and its thickness is controlled between 2-3mm. This ensures that the thickness will not affect the softness and fit of the upper sole 11, while providing sufficient torsional support.

[0025] Specifically, the upper surface of the upper sole 11 is precisely designed for the installation of the anti-torsion plate 15, and has an inwardly recessed mounting groove 112 that perfectly matches the shape of the anti-torsion plate 15. When the anti-torsion plate 15 is embedded in the mounting groove 112, its surface remains flush with the upper surface of the upper sole 11, which avoids foot discomfort caused by the protrusion of the anti-torsion plate 15, and ensures that the anti-torsion plate 15 and the upper sole 11 form an integral force-bearing structure.

[0026] This embedded anti-torsion plate 15 plays a crucial role during foot movement: when the foot is turning rapidly, stopping suddenly, or walking on uneven ground, excessive torsion can easily occur. The anti-torsion plate 15, through its excellent deformation resistance, effectively limits abnormal torsional angles, keeping the torsion within a safe range. This reduces the risk of sports injuries such as ankle sprains and ligament strains caused by excessive foot torsion, providing more comprehensive protection for the foot. At the same time, the lightweight properties of carbon fiber avoid increasing the weight of the sole due to the added anti-torsion structure, ensuring overall shoe comfort.

[0027] As attached Figure 1 and Figure 3 As shown, the lower sole 12, serving as the central support structure of the sole, is made of medium-density, preferably high-elastic EVA foam material, balancing elasticity and support, and bearing the main load-bearing task in the arch area. Its upper surface corresponds to the first arc-shaped connecting surface 111 of the upper sole 11, and a matching first connecting groove 122 is specifically provided. This first connecting groove 122 precisely covers the front-middle portion of the first arc-shaped connecting surface 111, achieving a tight fit between the two. Simultaneously, the rear edge of the lower sole 12 also features an inwardly concave design, forming a second arc-shaped connecting surface 121, creating structural conditions for connection with the rear sole 13.

[0028] As attached Figure 1 and Figure 3 As shown, the rear sole 13, serving as the rear support unit of the sole, utilizes a high-density, preferably modified, abrasion-resistant rubber material to enhance the support and stability of the heel area, effectively absorbing the impact generated during walking or exercise. Its upper surface features two functional connecting grooves: a second connecting groove 131 for covering the second arc-shaped connecting surface 121 of the lower sole 12, and a third connecting groove 133 for covering the rear end of the first arc-shaped connecting surface 111 of the upper sole 11. Specifically, a step 132 is cleverly incorporated within the second connecting groove 131, and the third connecting groove 133 is formed by an inward indentation from the upper surface of this step 132. To further enhance structural stability, a smooth connecting surface 123 is specially designed at the rear end of the lower sole 12. This smooth connecting surface 123 fits tightly against the side of the step 132, effectively improving the overall structural strength.

[0029] In the specific assembly process, a step-by-step positioning and bonding process can be adopted: First, the second arc-shaped connecting surface 121 of the lower sole 12 is precisely placed into the second connecting groove 131 of the rear sole 13, ensuring that the smooth connecting surface 123 is completely in contact with the side of the step 132. Then, adhesive is used for circumferential sealing and bonding, and it is cured by hot pressing at 80℃ to ensure a firm connection. Next, the upper sole 11 is precisely placed on the lower sole 12 and the rear sole 13, so that the front middle part of the first arc-shaped connecting surface 111 is completely embedded in the first connecting groove 122 of the lower sole 12, and the rear part is embedded in the third connecting groove 133 of the rear sole 13. The same adhesive is used for full bonding and fixing to complete the overall assembly. The entire assembly process forms a stable combined structure with both rigidity and elasticity through the multi-dimensional precise cooperation of the three connecting grooves and the two arc-shaped connecting surfaces.

[0030] Meanwhile, as attached Figure 2 As shown, the front end of the lower sole 12 and the rear end of the rear sole 13 both adopt an upward curve design. The upward angle of the front end of the lower sole 12 is controlled at 15-20°, and the upward angle of the rear end of the rear sole 13 is set at 10-15°. This precise angle control makes the entire sole present an arched curve that closely matches the natural walking posture of the human body. This curve is not a simple appearance design, but is developed based on a large amount of human gait analysis data, so that the foot can achieve a smooth transition from heel landing to toe pushing off the ground during the step, making the landing angle of each step closer to the natural physiological state of the human body.

[0031] This scientifically designed curve offers several significant advantages: First, during walking, the arched curve guides the foot to contact the ground at a more optimal angle, resulting in a more even distribution of pressure from the heel to the forefoot, effectively improving the elasticity and feedback efficiency of the sole. This allows for stronger support with each step, reducing energy loss. Second, it significantly reduces the load on foot muscles. By optimizing the force transmission path, it keeps the calf muscles and plantar fascia in a more relaxed state during walking. Real-world testing shows that after prolonged walking (e.g., 2 hours of continuous walking), foot muscle fatigue is reduced to some extent compared to wearing traditional soles, greatly alleviating the soreness and swelling associated with traditional soles.

[0032] As attached Figure 4As shown, diagram a represents a reference image of a shoe wearing a traditional sole, while diagram b represents a reference image of a shoe wearing the sole of this invention. Because the curved sole of this invention uses the center of gravity support point below the arch of the foot as its core, it cleverly changes the force distribution on the sole of the foot, readjusting the posture of the human body when standing or walking. This ensures that the waist and knees remain in a straight line, thereby reducing the possibility of the body leaning forward. When the foot steps on this curved sole, the force distribution on the sole changes from the traditional two-point support of the heel and forefoot to a balanced force distribution of the heel, arch, and forefoot. This force distribution naturally activates the deep muscles of the legs and feet, promoting balanced muscle development.

[0033] Long-term use of these curved soles not only improves poor standing and walking posture but also subtly shapes a graceful figure. For conditions like lower back pain and sagging buttocks caused by posture problems, it reduces pressure on the lower back by adjusting the center of gravity, while simultaneously engaging the gluteal muscles for a more upright posture. Furthermore, it has positive effects on overall health: it gradually alleviates chronic pain in the lower back, buttocks, legs, and feet caused by improper posture by optimizing force transmission pathways; during the recovery process of joint, muscle, ligament, and tendon injuries, its gentle support and cushioning reduce secondary stress on the injured area, creating a favorable environment for tissue repair; most importantly, it reduces the impact on the knee joint by distributing pressure on the lower limbs, significantly preventing and alleviating knee joint wear and tear, making it particularly suitable for people who need to stand or walk for long periods and for users in the recovery period from joint injuries.

[0034] In addition, as attached Figure 2 and Figure 3 As shown, to enhance the anti-slip performance of the sole, anti-slip pads 14 are installed on the bottom surfaces of both the lower sole 12 and the rear sole 13. These anti-slip pads 14 are preferably made of a composite material of highly elastic nitrile rubber and natural rubber, and their surface is designed with anti-slip textures to increase the coefficient of friction. This ensures good anti-slip performance while further enhancing the cushioning performance of the sole through its own elasticity, making wearing the shoe more comfortable and safe. It is especially suitable for long-distance walking or light exercise.

[0035] In summary, the sole of this invention consists of three parts: an upper sole 11, a lower sole 12, and a heel sole 13, each made of a material with a different density. The upper sole 11 uses a relatively soft density configuration to improve foot fit and comfort; the lower sole 12 uses a medium density to balance elasticity and support in the arch area; and the heel sole 13 uses a higher density to enhance support and impact absorption in the heel area. Through the differentiated design of material density, combined with the scientific proportion of thickness in each part, the sole forms a precisely matched mechanical response gradient in key stress areas such as the toe, arch, and heel, achieving optimal elastic feedback and support performance. This perfectly matches the biomechanical needs of human movement and improves comfort.

[0036] The above are merely specific embodiments of this utility model, but the design concept of this utility model is not limited thereto. Any non-substantial modifications made to this utility model using this concept shall be considered as an infringement of the protection scope of this utility model.

Claims

1. A multi-density arc-shaped shoe sole, characterized in that, The sole includes: The upper sole has an inwardly recessed edge at the bottom surface to form a first arc-shaped connecting surface; The lower sole has a first connecting groove on its upper surface that covers the middle of the front of the first arc-shaped connecting surface, and the rear bottom edge is recessed inward to form a second arc-shaped connecting surface; The rear sole has a second connecting groove covering the second arc-shaped connecting surface and a third connecting groove covering the rear end of the first arc-shaped connecting surface on its upper surface. Anti-torsion plate, the upper shoe sole is embedded with the anti-torsion plate; The upper sole, lower sole, and rear sole are made of materials with different densities. The upper sole is placed on the lower sole and rear sole. The front end of the lower sole and the rear end of the rear sole curve upwards to form an arc shape.

2. The multi-density arc-shaped sole as described in claim 1, characterized in that: The second connecting groove has a step, the upper surface of the step is recessed inward to form the third connecting groove, and the rear end of the lower shoe sole has a smooth connecting surface that abuts against the side of the step.

3. The multi-density arc-shaped sole as described in claim 1, characterized in that: Both the bottom and rear soles of the shoes are equipped with anti-slip pads.

4. The multi-density arc-shaped sole as described in claim 3, characterized in that: The anti-slip mat is made of elastic material.

5. The multi-density arc-shaped sole as described in claim 1, characterized in that: The upper surface of the shoe sole is provided with an inwardly recessed mounting groove, and the anti-torsion plate is embedded in the mounting groove.

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