A lightweight foamed shoe sole with built-in support skeleton

Abstract

The utility model discloses a kind of light foamed shoe soles of built-in support framework, including a bottom plate and foot contact pad plate by light foamed material composition, and a rigid or semi-rigid support framework, the bottom plate and foot contact pad plate outer edge place each other are adhered to form the member that carries out sealing to internal cavity, the support framework is completely covered in the inside of the shoe sole body that bottom plate and foot contact pad plate are composed, and with body by in-mold forming way combination as a whole structure;Additional support framework bears most structural stress and impact energy, greatly reduce the deformation amplitude and stress load that foamed material bears, to effectively delay the permanent compression deformation (i.e. "step collapse") and performance attenuation that foamed material appears due to repeated extrusion, significantly prolong the service life of shoe sole.

Description

Technical Field

[0001] This utility model relates to the field of shoe sole technology, specifically to a lightweight foam shoe sole with an internal support skeleton. Background Technology

[0002] With increasing health awareness and the popularization of active lifestyles, consumers are demanding higher performance from athletic shoes. As the core functional component of a shoe, the sole needs to achieve the optimal balance between lightweight, cushioning, stability, and durability. Lightweight foam materials, such as ethylene-vinyl acetate copolymer (EVA), polyolefin elastomers (POE), and supercritical foam materials based on their secondary foaming, have become the mainstream choice for manufacturing midsoles in modern athletic shoes due to their low density, good cushioning performance, and excellent processing properties. However, midsoles made solely of lightweight foam materials have a series of inherent and insurmountable technical drawbacks. In pursuit of ultimate lightweighting and cushioning, the density of the foam material is continuously reduced, directly leading to a decrease in its modulus and a weakening of the overall structural rigidity. During exercise, especially after lateral movement, rapid changes of direction, or prolonged walking, an overly soft midsole cannot provide effective lateral support and a stable push-off platform for the foot, easily leading to foot fatigue, instability, and even increasing the risk of sprains. This phenomenon is particularly prominent in sports requiring high stability, such as basketball and tennis. To compensate for the aforementioned shortcomings of foam materials, existing technologies have proposed some improvement solutions, but all of them have new problems. A common solution is to embed a rigid plastic or carbon fiber sheet (such as a TPU support sheet) in the arch of the foot. Although this approach improves torsional resistance to some extent, its effective area is localized and isolated. It cannot solve the problem of rigid support in the forefoot and heel areas. Furthermore, since the support sheet and the foam material are two completely different components, stress concentration can easily occur at their interface under long-term bending and impact, leading to peeling, delamination, or breakage. In addition, if the rigid support sheet is not designed properly in terms of position or shape, it can bring an uncomfortable feeling of being pushed up.

[0003] In view of the problems exposed in the current use of foam soles, it is necessary to improve and optimize the structure of foam soles. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides a lightweight foamed shoe sole with a built-in support skeleton, which has the feature of improving the support effect of the shoe sole.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a lightweight foamed shoe sole with an internal support frame, comprising a sole plate and a foot contact pad made of lightweight foamed material, and a rigid or semi-rigid support frame. The outer edges of the sole plate and the foot contact pad are bonded together to form a component that seals the internal cavity. The support frame is completely enclosed inside the shoe sole body composed of the sole plate and the foot contact pad, and is integrated with the body into an integral structure through in-mold molding. The support frame includes a heel area and a forefoot area, and a pad is fitted inside the heel area and the forefoot area. A protrusion is fitted on the upper surface of the pad. A support plate is provided at the bottom of the heel area and forefoot area of ​​the support frame. Several support columns are provided on the upper surface of the support plate. A rebound spring is provided at the outer edge of the support column. The top of the rebound spring contacts the bottom surface of the pad to support it.

[0006] As a preferred technical solution of the lightweight foamed shoe sole with built-in support frame of this utility model, a foamed pad layer is also filled between the foot contact pad and the protrusion.

[0007] As a preferred technical solution for a lightweight foamed shoe sole with an internal support frame according to this utility model, the material of the support frame is one of thermoplastic polyurethane, nylon, polyamide, carbon fiber composite material or engineering plastic. The supporting frame is a three-dimensional structure whose outline is adapted to the shape of the foot and covers at least the area extending from the heel area of ​​the sole to the forefoot area.

[0008] As a preferred technical solution of the lightweight foamed shoe sole with built-in support skeleton of the present invention, the support skeleton extends upward in the area corresponding to the side of the shoe sole to form a lateral support wall, the shoe sole body covers the lateral support wall, and a side wing made of foam material is formed on the outside of the lateral support wall.

[0009] As a preferred technical solution for a lightweight foamed shoe sole with an internal support frame according to this utility model, the shoe sole body is composed of two or more foamed materials with different densities. A first density foam material is provided around and / or at the bottom of the lateral support wall of the support frame, and a second density foam material is provided in the area not covered by the support frame, wherein the first density is greater than the second density.

[0010] As a preferred technical solution for a lightweight foamed shoe sole with an internal support frame according to this utility model, the lightweight foaming material is an ethylene-vinyl acetate copolymer, a polyolefin elastomer, or a supercritical foaming material.

[0011] Compared with the prior art, the beneficial effects of this utility model are: 1. The added support frame bears most of the structural stress and impact energy, greatly reducing the deformation range and stress load on the foam material, thereby effectively delaying the permanent compression deformation (i.e. "collapse") and performance degradation of the foam material caused by repeated extrusion and significantly extending the service life of the shoe sole.

[0012] 2. A large-area, strong physical bond is formed between the support frame and the foam material, avoiding the problems of glue separation, detachment, and abnormal noise that are prone to occur in traditional adhesive support plates. The overall structure is more reliable and durable. Moreover, by designing foam materials of different densities to combine with the frame in different areas, micro-control of sole performance can be easily achieved. Attached Figure Description

[0013] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0014] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the shoe sole in this utility model; Figure 3 This is a schematic diagram of the cross-sectional structure of the shoe sole in this utility model; In the diagram: 1. Base plate; 2. Foot contact pad; 3. Support frame; 4. Gasket; 5. Protrusion; 6. Support plate; 7. Support column; 8. Rebound spring; 9. Foam padding layer. Detailed Implementation

[0015] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model. Example

[0016] like Figure 1-3 As shown, the lightweight foamed shoe sole with built-in support frame of this utility model includes a sole plate 1 and a foot contact pad 2 made of lightweight foamed material, and a rigid or semi-rigid support frame 3. The outer edges of the sole plate 1 and the foot contact pad 2 are bonded to each other to form a component that seals the internal cavity. The support frame 3 is completely covered inside the shoe sole body composed of the sole plate 1 and the foot contact pad 2, and is combined with the body to form an integral structure through in-mold molding. The support frame 3 includes a heel area and a forefoot area. A pad 4 is fitted inside the heel area and the forefoot area. The pad 4 can be integrally formed with the support frame 3. A protrusion 5 is fitted on the upper surface of the pad 4. A support plate 6 is also provided at the bottom of the heel area and forefoot area of ​​the support frame 3. Several support columns 7 are provided on the upper surface of the support plate 6. A rebound spring 8 is also provided at the outer edge of the support column 7. The top of the rebound spring 8 contacts the bottom surface of the pad 4 to support it. The cooperation between the support frame 3 and the rebound spring 8 can further support the foot.

[0017] Specifically, a foam pad 9 is also provided between the foot contact pad 2 and the protrusion 5. In this embodiment, the foam pad 9 further enhances foot comfort.

[0018] Specifically, the material of the supporting frame 3 is one of thermoplastic polyurethane, nylon, polyamide, carbon fiber composite material or engineering plastic; The support frame 3 is a three-dimensional structure whose outline is adapted to the shape of the foot and covers at least the area extending from the heel of the sole to the forefoot area, further enhancing the support for the foot in this embodiment.

[0019] Specifically, the support frame 3 extends upward in the area corresponding to the side of the sole to form a lateral support wall. The sole body covers the lateral support wall, and a side wing made of foam material is formed on the outside of the lateral support wall. In this embodiment, this solution can further improve the structural stability of the sole.

[0020] Specifically, the sole body is composed of two or more foam materials with different densities; wherein a first density foam material is provided around the lateral support wall and / or the bottom of the support frame 3, and a second density foam material is provided in the area not covered by the support frame 3. The first density is greater than the second density. In this embodiment, this arrangement can further improve foot comfort.

[0021] Specifically, lightweight foaming materials include ethylene-vinyl acetate copolymers, polyolefin elastomers, or supercritical foaming materials.

[0022] The working principle and usage process of this utility model are as follows: In this technical solution, the sole is divided into a heel area and a forefoot area. A support frame 3 is set in this area to improve the structural strength of the sole. A rebound spring 8 is set inside the support frame 3 to allow the protrusion 5 to quickly return to its original position after being compressed. A support column 7 is set to support the pad 4 to further avoid fatigue of the pad layer due to excessive pressure. A support plate 6 is set at the bottom of the support frame 3 to prevent bottom punctures and to support the support frame 3, thereby improving the structural stability of the sole.

[0023] The above description is only a preferred embodiment of the present utility model and is not intended to further limit the present utility model. All equivalent changes made based on the description and drawings of the present utility model are within the protection scope of the present utility model.

Claims

1. A lightweight foam sole with an internal support frame, characterized in that: It includes a base plate (1) made of lightweight foam material and a foot contact pad (2), as well as a rigid or semi-rigid support frame (3). The base plate (1) and the foot contact pad (2) are bonded together at their outer edges to form a component that seals the internal cavity. The support frame (3) is completely covered inside the sole body composed of the base plate (1) and the foot contact pad (2) and is combined with the body into an integral structure by in-mold molding. The support frame (3) includes a heel area and a forefoot area. A pad (4) is fitted inside the heel area and the forefoot area. A protrusion (5) is fitted on the upper surface of the pad (4). A support plate (6) is provided at the bottom of the heel area and forefoot area of ​​the support frame (3). Several support columns (7) are provided on the upper surface of the support plate (6). A rebound spring (8) is provided at the outer edge of the support column (7). The top of the rebound spring (8) contacts the bottom surface of the pad (4) to support it.

2. The lightweight foam sole with an internal support frame according to claim 1, characterized in that: A foam pad layer (9) is also provided between the foot contact pad (2) and the protrusion (5).

3. The lightweight foam sole with an internal support frame according to claim 1, characterized in that: The material of the supporting frame (3) is one of thermoplastic polyurethane, nylon, polyamide, carbon fiber composite material or engineering plastic; The supporting frame (3) is a three-dimensional structure whose outline is adapted to the shape of the foot and covers at least the area extending from the heel area of ​​the sole to the forefoot area.

4. The lightweight foam sole with an internal support frame according to claim 1, characterized in that: The support frame (3) extends upward in the area corresponding to the side of the sole to form a lateral support wall, the sole body covers the lateral support wall, and a side wing made of foam material is formed on the outside of the lateral support wall.

5. The lightweight foam sole with an internal support frame according to claim 1, characterized in that: The sole is made of two or more foam materials with different densities; A first density foam material is provided around and / or at the bottom of the lateral support wall of the support frame (3), and a second density foam material is provided in the area not covered by the support frame (3), wherein the first density is greater than the second density.

6. The lightweight foam sole with an internal support frame according to claim 1, characterized in that: Lightweight foamed materials are ethylene-vinyl acetate copolymers, polyolefin elastomers, or supercritical foamed materials.

Images