Double-hardness rubber-coated heel lift for heel

Abstract

The utility model provides a double-hardness rubber-coated heel lift for a heel, which comprises a support body on the inner layer and a soft elastic body on the outer layer, the support body and the soft elastic body are made of the same materials with different hardness, a plurality of connecting columns used for being assembled with the heel are arranged on the surface of one end of the support body, and the connecting columns are connected with the soft elastic body. The soft elastic body wraps the bottom face and the side wall of the supporting body through injection molding and is inserted and meshed to form an integrated structure, and a plurality of through holes with different hole diameters at the upper end and the lower end are formed in the surface of the supporting body. The outer edge of the supporting body is at least partially provided with a serrated surrounding edge which is used for being matched with the soft elastic body to form a whole in an injection molding mode, the heel lift structure is high in stability, the fusion degree of the supporting body and the soft elastic body is high, and the delaminating phenomenon is not prone to occurring; even if grease or other pollutants enter in the injection molding process, the phenomenon that the heel lift is delaminated cannot be caused.

Description

Technical Field

[0001] This utility model relates to the field of shoe material accessories, and in particular to a dual-hardness coated heel cover for shoe heels. Background Technology

[0002] When walking, the heel is one of the main stress points and wears out relatively quickly on the bottom of the shoe, playing a crucial role in wearing comfort. Therefore, existing plastic heels, especially women's shoes, often feature an auxiliary component called a toplift or top piece that contacts the ground on the heel body.

[0003] Currently, the heel padding of shoes is mainly made of rubber or other elastomers with high hardness, which cannot simultaneously achieve properties such as anti-slip, noise reduction, and high wear resistance, and thus cannot meet the increasingly higher standards of the current consumer market.

[0004] Furthermore, existing double-layer tops, such as those published in CN106388128A, have manufacturing processes unsuitable for mass production: 1. The upper EVA and lower PU layers are prone to unevenness, affecting the aesthetics of the shoe; 2. The actual operation of bonding the upper and lower layers is difficult; 3. In this prior art, the shoe post is also made of soft material, making it impossible to properly assemble with the heel, resulting in low sturdiness after assembly. The double-layer structure, with different materials for the upper and lower layers, makes it difficult for them to fuse after casting, leading to delamination during subsequent use. It also requires adhesive bonding, which is environmentally unfriendly, thus this patent cannot be practically applied; CN208211603U (this patented product is only suitable for small tops with a landing diameter of less than 2.5 cm). This prior art uses the same material for casting, and although the upper and lower layers can fuse, if grease or other contaminants enter during processing, the upper and lower layers will not fuse, leading to delamination later; CN214547677. In the U series, the upper and lower layers are made of different materials (hard plastic and soft rubber), which may cause them to not fuse during injection molding. Even with edge binding, they are still prone to delamination after being worn. CN201967844U and CN2757634Y are similar. They are basically made of upper and lower layers. If grease or other contaminants or debris enter during processing, it will affect the tightness of the fusion between the upper and lower layers and make delamination easy to occur. Utility Model Content

[0005] To address the shortcomings of existing technologies, this utility model provides a dual-hardness coated top cover for shoe heels.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is: a dual-hardness rubber-coated top cover for shoe heels, comprising an inner support body and an outer soft elastomer. The support body and the soft elastomer are made of the same material with different hardness. One end surface of the support body has several connecting posts for assembly with the shoe heel. The soft elastomer is injection molded to cover the bottom and side of the support body and interlocked to form an integrated structure.

[0007] The surface of the support that is in at least partial contact with the soft elastomer has several through holes.

[0008] The through hole is located on the surface of the support body at one end where the connecting column is located. The diameter of the through hole is larger than that of the through hole on the other end surface. The through hole is a stepped hole or a tapered hole.

[0009] The outer edge of the support has a serrated border.

[0010] The outer edge of the support body has two layers of serrated edges, and the serrations of the two layers of serrated edges are staggered.

[0011] Both the support and the soft elastomer are made of TPU material.

[0012] The material hardness of the support is greater than that of the soft elastomer.

[0013] The beneficial effects of this utility model are as follows: This utility model provides a dual-hardness rubber-coated top cover for shoe heels. By setting stepped holes or conical holes and serrated edges, the top cover structure after injection molding has strong stability, high integration between the support body and the soft elastomer, and is not prone to delamination. Moreover, the special injection molding process and structure ensure that even if grease or other contaminants enter during the injection molding process, the top cover will not delaminate. This product uses environmentally friendly materials, and no additional glue is required in the manufacturing process, which is beneficial to environmental protection. The top cover made with this process combines the firmness and ease of use of the hard elastomer with the high anti-slip, shock-absorbing, quiet, and high wear-resistant properties of the soft elastomer outer layer and the ground layer.

[0014] This utility model also features a simple structure, convenient processing and easy assembly, making it highly practical. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the support structure of this utility model;

[0017] Figure 3 This is a cross-sectional structural diagram of the present invention. Detailed Implementation

[0018] like Figure 1-3 As shown in the figure, a dual-hardness rubber-coated top for shoe heels includes an inner support body 100 and an outer soft elastomer 200. The support body 100 and the soft elastomer 200 are made of the same material with different hardnesses. One end surface of the support body 100 has several connecting posts 110 for assembly with the shoe heel. The soft elastomer 200 is injection molded to cover the bottom and sides of the support body 100 in a one-piece structure. The support body 100 and the elastomer are made of the same material with different hardnesses. The soft elastomer 200 effectively ensures a high degree of fusion between the two during injection molding, preventing delamination. The connecting post 110 is used to connect and fix the top of the shoe to the bottom of the heel. The connecting post 110 and the support body 100 are integrally injection molded. In this embodiment, the soft elastomer 200 is injection molded by covering the support body 100 with its bottom and side surfaces, so that the bottom and side surfaces of the soft elastomer 200 are integrated with the support body 100 after injection molding, resulting in a higher degree of fastness after injection molding and making it less prone to delamination.

[0019] The support 100 has at least a portion of the surface in contact with the soft elastomer 200, which has several through holes 120. The purpose of providing through holes 120 in the support 100 is to facilitate the injection material entering the through holes 120 during injection molding of the soft elastomer 200. After cooling, the soft elastomer 200 is formed and fused with the support 100. By providing through holes 120, the contact area between the elastomer 200 and the support 100 is increased, thereby improving the fusion effect and the firmness of the fused parts.

[0020] The through hole 120 is located on the end surface of the support body 100 where the connecting post 110 is located. The diameter of the through hole 120 is larger than that of the through hole 120 on the other end surface. The through hole 120 is a stepped hole or a conical hole. In this embodiment, a stepped hole with a larger diameter at the top and a smaller diameter at the bottom is used. The purpose of using a stepped hole or a conical hole is to further improve the fusion strength between the soft elastomer 200 and the support body 100. Even if grease or other contaminants enter during the injection molding process, resulting in a low degree of fusion between the soft elastomer 200 and the support body 100, the soft elastomer 200 and the support body 100 will not directly delaminate and separate.

[0021] The outer edge of the support 100 has a serrated edge 130. The serrated edge 130 is also designed to increase the contact area between the support 100 and the soft elastomer 200, so that the soft elastomer 200 can be more firmly connected and fused with the support 100 during secondary injection molding.

[0022] The support body 100 has two layers of serrated edges 130 on its outer edge, and the serrations of the two layers of serrated edges 130 are staggered. The serrated edges 130 with staggered serrations are designed so that the support body 100 and the soft elastomer 200 can interlock with each other, thereby improving the degree of integration and firmness.

[0023] Both the support 100 and the soft elastomer 200 are made of TPU material.

[0024] The support 100 is made of a material with a hardness greater than that of the soft elastomer 200. Only materials of the same type can be fused together during injection molding, resulting in a stronger connection in the finished product and making it less prone to delamination.

[0025] A manufacturing process for a rubber-coated ceiling sheet includes the following steps: Step 1: Injecting rubber and plastic material into a support body 100 using a dedicated mold for the support body. The dedicated mold for the support body in this step is determined according to actual needs and shape, and its simple structure does not pose insurmountable technical difficulties for those skilled in the art; therefore, it is not subject to excessive limitations. Step 2: Placing the injection-molded support body 100 into a dedicated mold for secondary injection molding of a soft elastomer, and simultaneously injecting elastomer material into the soft elastomer 200 using the dedicated mold to form an elastomer that is integrated with the support body into a single product. The dedicated mold for secondary injection molding of the soft elastomer in this step is the same as the dedicated mold for the support body, both determined according to actual needs, and both are conventional molds with low mold-making difficulty; therefore, it will not be described in detail.

[0026] In step one, the material used to make the support body 100 is a rubber and plastic material with a Shore hardness of 90A (or Shore hardness of 60D) or higher, with TPU being the preferred material. This is because the support body 100 plays the role of supporting and connecting the heel of the shoe, so its material must have both a certain toughness to resist impact and the hardness to provide support.

[0027] In step one, the injection molding temperature of the support 100 is between 170 degrees Celsius and 280 degrees Celsius. In this embodiment, the injection molding temperature in step one is preferably 215 degrees Celsius.

[0028] In step two, the soft elastomer 200 is made of rubber and plastic elastomer material with a Shore hardness of 78A to 50A, preferably TPU.

[0029] Because the soft elastomer 200 needs to meet the requirements of anti-slip, noise reduction, and wear resistance, it is made of a soft elastic material with low hardness and high wear resistance.

[0030] In step two, the injection molding temperature of the soft elastomer 200 is between 150 degrees Celsius and 185 degrees Celsius, and the preferred injection molding temperature in step two is 185 degrees Celsius.

[0031] The TPU material in this embodiment is thermoplastic polyurethane elastomer rubber, which is an environmentally friendly new elastomer material.

[0032] This embodiment uses injection molding, which is simpler and more practical than casting or pouring. The product after injection molding has a more beautiful appearance and higher precision and fit.

[0033] This invention provides a dual-hardness coated heel top and its manufacturing process. The heel top produced by this process has strong structural stability, high integration of the support body and elastomer, and is not prone to delamination. Furthermore, the special injection molding process and structure ensure that even if grease or other contaminants enter during the injection molding process, the heel top will not delaminate. The heel top made using this process combines the strength and ease of use of a hard elastomer with the high slip resistance, shock absorption, noise reduction, and high wear resistance of the soft elastomer outer layer and the ground layer.

[0034] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Simple modifications and substitutions made by those skilled in the art without departing from the spirit and scope of this utility model are within its protection scope.

Claims

1. A dual-hardness coated heel cover for shoe heels, characterized in that, The device includes an inner support layer and an outer soft elastomer. The support layer and the soft elastomer are made of the same material with different hardness. One end of the support layer has several connecting posts for assembly with the heel. The soft elastomer is injection molded to cover the bottom and side of the support layer and interlocks to form an integral structure. The surface of the support layer has several through holes with different diameters at the top and bottom ends. The outer edge of the support layer has at least a partial serrated edge for injection molding the soft elastomer to form an integral structure.

2. The dual-hardness coated heel cover as described in claim 1, characterized in that, The through hole is located on the surface of the support body at one end where the connecting column is located. The diameter of the through hole is larger than that of the through hole on the other end surface. The through hole is a stepped hole or a tapered hole.

3. The dual-hardness coated heel cover as described in claim 1, characterized in that, The outer edge of the support body has two layers of serrated edges, and the serrations of the two layers of serrated edges are staggered.

4. The dual-hardness coated heel cover as described in claim 1, characterized in that, Both the support and the soft elastomer are made of TPU material.

5. The dual-hardness coated heel cover as described in claim 4, characterized in that, The material hardness of the support is greater than that of the soft elastomer.

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