Heel assembly suitable for upper-connected injection molding process

Abstract

The utility model discloses a heel component suitable for an upper-connected injection molding process, which comprises a framework and an anti-slip mat, the anti-slip mat is fixed at the lower end of the framework, decorative strips made of leather are tightly attached to the peripheral side walls of the framework, and the decorative strips at least continuously cover the two sides and the rear side area of the framework. The interior of the framework is hollow, the framework comprises a plurality of supporting ribs arranged in the framework, the supporting ribs are separated to form a plurality of material cavities, the upper end of the framework is provided with a top opening communicated with the material cavities, and the material cavities are filled with polyurethane filler in an injection molding mode. The utility model has the advantages of simple structure, simple production process, lower cost, better texture and better comfort when being worn.

Description

Technical Field

[0001] The utility model relates to the technical field of footwear products, and particularly relates to a heel assembly suitable for the in-mold injection process. Background Art

[0002] The Goodyear Welted construction, also known as the Goodyear Stitchdown construction, is a traditional shoemaking technique named after its inventor, Charles Goodyear Jr. This technique was developed by the Goodyear company in the late 19th century and is still used by many high-end shoemakers today. The Goodyear Welted construction features a stitched strip called a "welt" between the sole and the upper. The sole is usually made of one or more layers of leather and is then stitched to the upper through the "welt" strip.

[0003] The sole made by the Goodyear Welted construction uses genuine leather material, which has a good texture and a relatively beautiful appearance. However, the production of the sole heavily relies on manual work, with a complex manufacturing process, high labor costs, and a relatively high weight of the resulting sole, as well as weak elastic cushioning performance, which affects the wearing comfort. In addition, manual operation is also required when stitching it to the upper.

[0004] The in-mold injection process is a modern shoemaking technique mainly used for producing plastic shoes, rubber shoes, and some other types of casual shoes. The main feature of this process is to directly inject the sole material into the upper mold, thus forming the overall shape of the shoe in one go. Besides directly forming the sole on the basis of the upper, the in-mold injection process can also inject molten material between a prefabricated sole and the upper, and after solidification, reliably connect the sole and the upper together. Summary of the Invention

[0005] The utility model provides a heel assembly suitable for the in-mold injection process, which has a simple structure, simple production processes, low costs, a good texture, and better comfort when worn.

[0006] The heel assembly applicable to the integral molding process of shoes of the utility model includes a skeleton and an anti-slip pad. The skeleton can be formed by 3D printing technology or injection molding process. The anti-slip pad can be made of rubber material and can be fixed to the lower end of the skeleton by glue. The lower end of the anti-slip pad is provided with anti-slip patterns for contacting the ground. The peripheral side walls of the skeleton are closely provided with decorative strips made of leather material. The decorative strips at least continuously cover the two sides and the rear side area of the skeleton. The decorative strips can provide the real leather texture on the appearance of the heel assembly and improve the aesthetics of the heel assembly. The interior of the skeleton is hollow. The skeleton includes a plurality of support ribs arranged inside it, which helps to reduce the weight of the skeleton and improve the structural strength of the skeleton. A plurality of material cavities are formed by separating between the plurality of support ribs. The upper end of the skeleton is provided with a top opening communicating with the plurality of material cavities. Polyurethane (PU) filler is injection molded and filled in the material cavities through the integral molding process of shoes. The polyurethane filler can play a role in strengthening the heel assembly and improving the elasticity when wearing and walking on the heel assembly, and improve the comfort when wearing.

[0007] Further, the side walls between the two sides and the rear side of the anti-slip pad protrude relative to the side walls between the two sides and the rear side of the skeleton and form a U-shaped edge. A U-shaped groove is formed between the upper end surface of the U-shaped edge and the side wall of the skeleton. The shape of the decorative strip is adapted to the U-shaped groove and is embedded in the U-shaped groove. The overall structure is relatively compact and beautiful, and enables a certain distance to be maintained between the lower end of the decorative strip and the ground when wearing and walking on the heel assembly, preventing the decorative strip from contacting the ground and being worn. In addition, the U-shaped edge can also play a role in cooperating with the lower end of the decorative strip for limiting, facilitating the adhesive assembly of the decorative strip.

[0008] Further, the outer side wall of the decorative strip is flush with the outer side wall of the U-shaped edge, improving the integration of the decorative strip and the side part of the anti-slip pad and the aesthetics of the heel assembly.

[0009] Since it is difficult to keep the thickness of the decorative strip made of natural leather material consistent, further, the outer side walls of the decorative strip and the U-shaped edge are polished together to make them flush, and then polished to improve the brightness and aesthetics. During specific implementation, decorative strips and anti-slip pads of the same color are selected to improve the integration.

[0010] Further, the front side wall of the anti-slip pad protrudes relative to the front side wall of the skeleton and forms a flange. The two side walls of the skeleton extend forward to form two convex walls. A notch is formed between the two convex walls of the skeleton and the flange of the anti-slip pad. Polyurethane filler is injection molded and filled in the notch. The front ends of the convex walls, the front end of the polyurethane filler, and the front end of the U-shaped decorative strip can be kept in a flush state through grinding treatment, and the brightness is improved through polishing to improve the aesthetics.

[0011] Further, a notch communicating the interior of the skeleton and the gap is provided at the front top of the skeleton, enabling the molten polyurethane filler to flow between the interior of the skeleton and the gap, so that the polyurethane fillers on the inner and outer sides of the skeleton can be integrally injection-molded, facilitating production and processing. In addition, it can also improve the bonding effect with the skeleton.

[0012] Further, a plurality of protrusions are provided on the front side of the skeleton. The protrusions can improve the bonding effect between the skeleton and the polyurethane filler and are not easily separated from the skeleton.

[0013] Further, a plurality of bottom openings corresponding to and communicating with the material cavities are provided at the lower end of the skeleton. The bottom openings enable the polyurethane filler injection-molded in the material cavities to bond with the anti-slip pad at the same time, improving the bonding effect.

[0014] Further, one of the material cavities is located at the central position of the skeleton. This material cavity is preferably circular. The other material cavities are arranged circumferentially around this material cavity. The top height of the support ribs for separating adjacent material cavities in the circumferential direction gradually decreases towards the central position of the skeleton. This material cavity at the central position corresponds to the calcaneus of the heel when the shoe is worn. The setting of the central material cavity can improve the elasticity of the central position of the heel after filling with the polyurethane filler, enabling the polyurethane fillers in the plurality of material cavities to be integrally connected together, thereby further improving the comfort during wearing.

[0015] The beneficial effects of the present utility model are as follows: simple structure, low production cost, maintaining the texture of genuine leather in appearance, light in weight, elastic, and having better comfort during wearing. Description of the Drawings

[0016] Figure 1 is a schematic structural view of an embodiment of the present utility model;

[0017] Figure 2 is a perspective view of the connection between the skeleton and the anti-slip pad in an embodiment of the present utility model;

[0018] Figure 3 is a connection schematic view of the skeleton and the anti-slip pad in an embodiment of the present utility model;

[0019] Figure 4 is a front view of the connection between the skeleton and the anti-slip pad in an embodiment of the present utility model;

[0020] Figure 5 is a side view of the connection between the skeleton and the anti-slip pad in an embodiment of the present utility model;

[0021] Figure 6 is a side view of an embodiment of the present utility model;

[0022] Figure 7It is a schematic structural diagram of the skeleton of an embodiment of the utility model. DETAILED DESCRIPTION

[0023] The utility model is suitable for the implementation of the heel component of the upper injection molding process, for example Figures 1-7 As shown, it includes a frame 1 and an anti-skid pad 2. The frame 1 can be manufactured by 3D printing technology or injection molding technology. The anti-skid pad 2 can be made of rubber material. The anti-skid pad 2 can be fixed to the lower end of the frame 1 by glue. The lower end of the anti-skid pad 2 is provided with an anti-skid pattern 21, which is used to contact the ground to increase friction. The side walls of the frame 1 are tightly provided with decorative strips 3 made of leather material. The decorative strips 3 are at least continuously covered on both sides and the rear area of ​​the frame 1. The decorative strips 3 can provide a leather feel on the appearance of the heel assembly, thereby improving the heel assembly. Aesthetics: the interior of the skeleton 1 is hollow and includes a plurality of supporting ribs 11 arranged therein, which helps to reduce the weight of the skeleton 1 and improve the structural strength of the skeleton 1. A plurality of material cavities 12 are formed between the plurality of supporting ribs 11. A top opening 101 connected to the plurality of material cavities 12 is provided at the upper end of the skeleton 1. Polyurethane (PU) filler is injection molded and filled in the material cavity 12 through a continuous injection molding process. The polyurethane filler can reinforce the heel assembly and improve the elasticity of the heel assembly when worn and walking, thereby improving the comfort when worn.

[0024] The side walls between the two sides and the rear side of the anti-slip pad 2 are protruding relative to the side walls between the two sides and the rear side of the frame 1 and are formed with a U-shaped rib 22. A U-shaped groove a is formed between the upper end surface of the U-shaped rib 22 and the side wall of the frame 1. The shape of the decorative strip 3 is adapted to the U-shaped groove a and is embedded in the U-shaped groove a. The decorative strip 3 is fixed in the U-shaped groove a by gluing. The overall structure is compact and beautiful, and the lower end of the decorative strip 3 can maintain a certain distance from the ground when the heel assembly is worn and walked, preventing the decorative strip 3 from contacting the ground and being worn. In addition, the U-shaped rib 22 can also cooperate with the lower end of the decorative strip 3 to limit the position, which is convenient for gluing and assembling the decorative strip 3.

[0025] The outer side wall of the decorative strip 3 is flush with the outer side wall of the U-shaped retaining edge 22, thereby improving the sense of unity between the decorative strip 3 and the side of the anti-slip pad 2 and improving the aesthetics of the heel assembly.

[0026] Since the thickness of the decorative strip 3 made of natural leather is difficult to be kept consistent, the outer wall of the decorative strip 3 and the outer wall of the U-shaped retaining edge 22 are further polished together to keep them flush, and then polished to improve the brightness and aesthetics. In specific implementation, the decorative strip 3 and the anti-slip pad 2 are selected in the same color to improve the sense of unity.

[0027] The front side wall of the anti-slip pad 2 protrudes relative to the front side wall of the skeleton 1 and forms a flange 23. Two convex walls 13 extend forward from the two side walls of the skeleton 1. A notch b is formed between the two convex walls 13 of the skeleton 1 and the flange 23 of the anti-slip pad 2. The notch b is filled with a polyurethane filler by injection molding. The front ends of the convex walls 13, the front end of the polyurethane filler, and the front end of the U-shaped decorative strip 3 can be kept flush by grinding, and the brightness can be improved by polishing to enhance the aesthetics.

[0028] A notch 14 communicating with the inside of the skeleton 1 and the notch b is provided at the front top of the skeleton 1, enabling the molten polyurethane filler to flow between the inside of the skeleton 1 and the notch b. At the same time, it can also facilitate the flow of the filler to, for example, the cavity of the sole corresponding to the front part of the foot, so that the polyurethane fillers inside and outside the skeleton 1 can be integrally injection-molded, which is convenient for production and processing. In addition, it can also improve the bonding effect with the skeleton 1. This notch 14 can also be used for the molten injection material to flow between different chambers of the mold when injecting the sole at the sole part of the foot.

[0029] A number of protrusions 15 are provided on the front side of the skeleton 1. The setting of the protrusions 15 can improve the bonding effect between the skeleton 1 and the polyurethane filler, and it is not easy to separate and fall off from the skeleton 1.

[0030] A plurality of bottom openings 16 corresponding to and communicating with the material cavity 12 are provided at the lower end of the skeleton 1. The setting of the bottom openings enables the polyurethane filler injection-molded in the material cavity 12 to bond with the anti-slip pad 2 at the same time, improving the bonding effect.

[0031] One of the material cavities 12a is located at the central position of the skeleton 1. This material cavity 12a is preferably circular. The other material cavities 12 are arranged circumferentially around the periphery of this material cavity 12a. The top height of the support ribs 11 separating the circumferentially adjacent material cavities 12 gradually decreases towards the central position of the skeleton. This material cavity 12a located at the central position corresponds to the calcaneus of the heel when the shoe is worn. The setting of the circular material cavity 12a can improve the elasticity at the center position of the heel after filling with the polyurethane filler, enabling the polyurethane fillers in the multiple material cavities 12 to be integrally connected together, improving the structural strength and the comfort during wearing.

[0032] In specific applications, first bond and connect the skeleton 1, the decorative strip 3, and the anti-slip pad 2 together, and then load them into a mold. Through the injection molding process, inject the molten polyurethane filler from above the skeleton 1 into the material cavity 12 of the skeleton 1 and the notch b. The front of the notch b is blocked by the mold to form a relatively closed material cavity. Through the pressing of the upper and lower molds, a first injection molding formation with a relatively high density is formed. Through the limitation of the mold, this first injection molding formation can simultaneously extend to the forefoot area of the shoe to form the front part of the sole. The first injection molding formation has physical properties of high temperature resistance and wear resistance. Then, through the in-mold injection molding process, inject the molten polyurethane filler again between the upper part of the first injection molding formation and the shoe upper to form a second injection molding formation with a relatively low density. The second injection molding formation can firmly bond the shoe upper and the first injection molding formation together, so that the heel assembly is firmly fixed under the shoe upper. In addition, the second injection molding formation has better elasticity and can improve the comfort during wearing.

[0033] To facilitate the demolding of the heel assembly, a notch 24 is provided on the front side of the anti-slip pad 2 corresponding to the inner side direction of the foot. Due to the walking posture, the front inner side of the heel is likely to come into contact with the ground. The setting of this notch 24 makes the heel assembly not easily interfere with the ground during wearing and improves the safety of walking.

[0034] The above embodiments are only one of the preferred specific embodiments of the present invention. The ordinary changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention are included in the protection scope of the present invention.

Claims

1. A heel assembly suitable for upper injection molding process, characterized in that: The invention comprises a frame and an anti-skid pad, wherein the anti-skid pad is fixed at the lower end of the frame, and decorative strips made of leather are tightly arranged on the four side walls of the frame, and the decorative strips made of leather are at least continuously covered on the two sides and the rear area of ​​the frame, and the interior of the frame is hollow, and the frame comprises a plurality of supporting ribs arranged therein, and a plurality of material cavities are formed between the plurality of supporting ribs, and a top opening connected to the plurality of material cavities is arranged at the upper end of the frame, and the material cavities are injection-molded and filled with polyurethane fillers.

2. The heel assembly suitable for upper injection molding process according to claim 1, characterized in that: The side walls between the two sides and the rear side of the anti-slip pad are protruding relative to the side walls between the two sides and the rear side of the frame and form a U-shaped rib, and a U-shaped groove is formed between the upper end surface of the U-shaped rib and the side wall of the frame, and the shape of the leather decorative strip is adapted to the U-shaped groove and is embedded in the U-shaped groove.

3. The heel assembly suitable for upper injection molding process according to claim 2, characterized in that: The outer side wall of the leather decorative strip is flush with the outer side wall of the U-shaped retaining edge.

4. The heel assembly suitable for upper injection molding process according to claim 3, characterized in that: The outer side wall of the leather decorative strip and the outer side wall of the U-shaped retaining edge are ground and polished.

5. The heel assembly suitable for upper injection molding process according to claim 4, characterized in that: The leather decorative strip and the anti-slip pad have the same color.

6. The heel assembly suitable for upper injection molding process according to claim 2, characterized in that: The front side wall of the anti-skid pad is protruding relative to the front side wall of the frame and forms a flange. The side walls of the frame extend forward to form two convex walls. A gap is formed between the two convex walls of the frame and the flange of the anti-skid pad. The gap is injection-molded and filled with polyurethane filler.

7. The heel assembly suitable for upper injection molding process according to claim 6, characterized in that: The top of the front side of the frame is provided with a notch communicating with the interior of the frame and the notch.

8. The heel assembly suitable for upper injection molding process according to claim 6, characterized in that: A plurality of protrusions are arranged on the front side of the frame.

9. The heel assembly suitable for upper injection molding process according to claim 1, characterized in that: The lower end of the frame is provided with a plurality of bottom openings correspondingly communicating with the material cavities.

10. The heel assembly suitable for upper injection molding process according to claim 1, characterized in that: One of the material cavities is located at the center of the frame, and the other material cavities are distributed circumferentially along the periphery of the material cavity. The top height of the supporting ribs for separating circumferentially adjacent material cavities is gradually lowered toward the center of the frame.

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