JPH0529405U - Shoe sole structure - Google Patents

Abstract

(57) [Abstract] [Purpose] In the case where the outsole is formed by injection molding of resin or the like, good shape can be maintained without problems such as shrinkage distortion and deformation due to cooling, and a pair of heels required An object of the present invention is to provide a shoe sole structure which can obtain impact strength and can maintain an appropriate cushioning property while ensuring the effect particularly when the outsole has an anatomy structure. [Structure] A shoe sole structure in which an outsole 4 including a heel portion 4a is integrally formed. A hard heel core 5 is embedded in the heel portion 4a of the outsole 4. The heel core 5 is attached to the insole 2 via the elastic layer 6. The heel core 5 reduces the resin volume of the heel portion 4a and eliminates the difference in cooling speed with other portions, thus preventing the occurrence of contraction strain, ensuring the rigidity of the heel portion 4a, and improving the impact strength and stability. .. Since the hardness of the heel core 5 is relaxed by the elastic layer 6, it is not necessary to use a thick insole or an insole on the surface where the heel core 5 is embedded, and the effect of the anatomy structure is secured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a shoe sole structure suitable for women's shoes and other shoes in which the height of the heel portion is higher than that of other portions, and particularly, a shoe sole structure effective for application of the direct sawing manufacturing method. Regarding

[0002]

[Prior Art]

 Conventionally, as a direct sawing method, a method of integrally forming a shoe sole by injection molding of resin or the like is known. In this direct sawing manufacturing method, the last mold in which the bag-shaped body in which the cover and the insole are integrally sewn together is fitted, the bottom mold arranged below the bottom mold, and the side molds arranged around them. A cavity is formed by and the synthetic resin is injected into this cavity to integrally mold the sole (sole) including the heel, and at the same time, this sole and the cover and midsole are integrated. Be combined with. Such a shoe sole structure formed by injection molding of resin or the like has advantages that it is easy to manufacture, the material cost is low, and it is durable, and therefore, it is applied to many shoes.

However, when the wall thickness of the heel part of the shoe sole (outsole) is larger than the wall thickness of other parts, such as women's shoes and other types of shoes in which the heel part is raised to some extent, Due to the difference in cooling rate after injection molding, solidification of the heel part is slower than other parts. For this reason, there is a case where the heel part is demolded in a state where the inside of the heel part is not sufficiently cooled, and in that case, there is a problem that the outer shape is deformed due to solidification in the demolded state. Although it is possible to secure a perfect outer shape by devising the injection cycle and setting the cooling time, there are many losses in the injection cycle time, which lowers manufacturing efficiency and causes cost increase. ..

Moreover, when there is a large difference in wall thickness, contraction strain (so-called sinkhole) occurs due to the difference in cooling rate, and when the shoe sole is deformed or a sinkhole occurs on the outer surface, It looks bad. In addition, when the heel is thick, not only the weight of the shoe increases, but also the rigidity of the heel is insufficient, and the heel may be laterally shaken when it is shocked during wearing. However, there are also problems such as deterioration of stability during grounding.

[0005]

[Problems to be solved by the device]

 Therefore, in the past, as a means to prevent the shrinkage strain of the thick-walled heel from occurring by equalizing the cooling rate of the outsole, and to reduce the weight of the thick-walled heel, a columnar shape, a wall-like shape, or a mesh-like shape was formed inside the heel. It was considered to reduce the volume of the resin material at the heel part by forming the skeleton of and forming the cavity. However, this method is not only troublesome in setting the shape and size of the skeleton, and by extension, the size of the cavity, but also does not necessarily eliminate the lack of rigidity of the heel part, and it does not necessarily have impact strength or wearability. Problems such as a decrease in sense of stability cannot be solved.

Further, as a means for coping with the decrease in impact strength, it is considered to increase the rigidity of the resin material. However, when a high-rigidity resin material is used, the hardness of other parts such as the stepping part, which requires elasticity, becomes excessively high, resulting in not only reduced comfort but also wear resistance. A problem such as a decrease in bleeding occurs.

Therefore, the inventors of the present invention have conducted various studies to solve the above-mentioned problems in injection molding and to improve the impact resistance of the heel. For example, embedding a heel core made of a hard material in the heel portion of the outsole. In this case, if the heel core of appropriate size is embedded, it should be possible to make the thickness of the outsole constant and partially improve the rigidity. However, this means alone does not always provide a sufficient effect on the wearer's shoes. This is because most of the total load of a person is supported by the heel part, and simply embedding the heel core causes the hardness of the sole of the shoe sole to be too high, and the impact resistance during walking or the like may increase. This is because the force is large and a feeling of fatigue is easily accumulated.

In particular, there is a problem in the case of adopting the anatomy structure on the outsole, which has been receiving attention in recent years. In other words, the outsole of the anatomy structure has a three-dimensional surface with which the foot contact surface conforms to the uneven shape of the sole of the person's foot, and it has the advantages that it is comfortable to wear and there is little fatigue during walking. is there. When such an anatomy structure is adopted, the anatomy structure of the foot contact surface of the outsole needs to be transmitted to the sole of the person as it is in order to fully exert its effect. However, when the hardness of the outsole, especially the heel part is excessively high, there is a problem that the impact reaction force at the time of wearing becomes large as described above. However, if you attach a thick insole or insole made of a highly flexible material to this excessively high hardness part, the anatomical structure of the bottom foot contact surface will be applied to the sole of the person. It will not be transmitted and the effect of the anatomy structure will be destroyed.

The present invention has been made under such circumstances, and in the case where the outsole is formed by injection molding of resin or the like, problems such as shrinkage distortion and deformation due to the difference in cooling rate occur. It is possible to maintain a good shape without any damage, and to obtain the required impact strength of the heel part. In particular, when the foot contact surface of the outsole has an anatomy structure, the effect is secured and an appropriate cushioning property is secured. An object of the present invention is to provide a shoe sole structure capable of holding even.

[0010]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the sole structure of the present invention is an injection-molded shoe sole structure in which a sole including a heel portion is integrally formed. And a hard heel core is embedded, and the heel core is attached to the bottom surface of the insole via an elastic layer. The shoe sole structure of the present invention is also characterized in that the foot contact surface of the shoe sole has an anatomy structure.

[0011]

[Action]

 According to the above configuration, since the heel core that is harder than that of the outsole is embedded in the outsole heel part, when the outsole is formed by injection molding of resin or the like, the thick heel part and other It is possible to eliminate a large difference in cooling rate between the part and the part, thereby eliminating problems such as deformation and shrinkage strain. Also, since the rigidity of the thick-walled heel part can be secured by the above-mentioned heel core, the heel part will not be laterally shaken even when shocked during wearing, and the stability at the time of grounding Is improved. Furthermore, if a lightweight material is used as the material of the heel core, it also leads to weight reduction.

Moreover, since the heel core is embedded in the outsole heel while being joined to the insole via the elastic layer, the elastic layer provides a sufficient cushion when walking or the like. It is effective and therefore comfortable to wear. In particular, when the foot contact surface of the outsole has an anatomy structure, since the high hardness of the heel core is alleviated by the sufficient cushioning effect of the elastic layer, a material having a high flexibility to the heel core part. Since it is not necessary to attach an insole or insole made of anatomical structure, it is possible to contact (transmit) to the sole of a person with an anatomy structure, and the effect of the anatomy structure can be secured and an appropriate cushioning effect can be secured at the same time. Very good characteristics of the anatomy structure can be obtained.

[0013]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows the overall structure of a shoe to which the shoe sole structure according to this embodiment is applied. In this shoe, a cover 1 and an insole 2 are sewn together at a mounting portion 3, high-frequency fusion or bonded by an adhesive, and a part of the cover 1 and the insole 2 are covered to form a book. The bottom 4 is integrally formed. The outsole 4 is of a high heel / thick wall type and is formed by injection molding of expandable or non-expandable polyurethane, polyvinyl chloride, thermoplastic rubber, rubber or the like.

A hard heel core 5 is embedded in the heel portion 4 a of the outsole 4. The heel core 5 is made of, for example, cork, wood chips compressed with resin, EVA (ethylene-vinyl acetate), which is harder than the outsole 4 described above. Then, the heel core 5 is attached to the lower surface of the insole 2 via the elastic layer 6. The elastic layer 6 is made of, for example, rubber sponge, EVA foam, polyethylene foam, or the like.

FIG. 2 shows a disassembled structure of the heel core 5 and the elastic layer 6 from the ground contact surface side in terms of shape and arrangement. As shown in the figure, the heel core 5 and the elastic layer 6 have a semi-elliptical shape in which the rear part has a semi-arcuate shape and the front part forms a substantially straight line, and they are bonded to each other by an adhesive in this example. 6 is joined to the insole 2 by an adhesive in this example. The joint between the heel core 5 and the elastic layer 6 is not limited to the case of using an adhesive, and the elastic layer 6 is manufactured by applying the above-mentioned material of the elastic layer 6 on the heel core 5 and foaming the same. It is also possible to use a method such as joining people.

Further, the heel core 5 may be a block shape in which the planar shape as a whole is flat as shown in FIG. 2, or may be one having a surface shape as shown in FIG. FIG. 3 shows only the shape of the heel core 5 from the upper surface side, and an arbitrary number of grooves 7 are formed in the vertical and horizontal directions on the upper surface of the heel core 5, that is, on the foot contact side. A resin material is inserted into the groove 7 when molding the bottom.

FIG. 4 shows a molding mode of the outsole 4 of a shoe to which the shoe sole structure of the present invention shown in FIG. 1 is applied. In this example, the direct sawing method is applied. That is, the cavity 14 is formed by the last mold 11 in which the armor cover 1 and the insole 2 are fitted, the bottom mold 12 arranged under the last mold 11, and the side mold 13 arranged around them. .. Inside the cavity 14, for example, the above-mentioned outsole material such as synthetic resin is injection-molded from a gate 15 provided in the side mold 13, whereby the outsole 4 is integrally molded, and at the same time, the outsole 4 and A part of the armor cover 1 and the insole 2 are integrally joined.

According to this example, since the hard heel core 5 is embedded in the heel portion 4a of the outsole 4, when the outsole 4 is constructed by the direct sawing manufacturing method shown in FIG. Since the material volume of 4a is smaller by the volume of the heel core 5, a large difference in cooling rate between the heel portion 4a and other portions can be eliminated. Therefore, since the heel portion 4a side is cooled and solidified almost at the same time as the other portions, it is not necessary to set a particularly troublesome injection cycle time or extra cooling time, and a sinkhole of the heel portion 4a is generated after demolding. Based on this, problems such as deformation of the outsole 4 or defective appearance can be solved. In addition, the presence of the hard heel core 5 improves the impact resistance of the heel portion 4a, can prevent problems such as sideways movement, and uses a material that is lighter than the material of the outsole 4 as the material of the heel core 5. Then, the outsole 4 can be made lighter by the amount of the heel core 5.

Further, the heel core 5 is embedded in the outsole 4 in a state of being joined to the insole 2 via the elastic layer 6, so that the elastic layer can be used when walking while wearing the shoes. 6 gives a good cushioning effect and is therefore comfortable to wear. In particular, when the foot contact surface of the outsole 4 has an anatomy structure, the surface in which the high hardness heel core 5 is embedded has a thick insole or middle shell made of a highly flexible material. Since it is not necessary to install a floor, the effect of the anatomy structure is not lost.

As shown in FIG. 3, when the longitudinal and lateral grooves 7 are formed on the foot contact surface side of the heel core 5, the bottom material is inserted into this groove 7 during injection molding. Since it is solidified, the embedded state of the heel core 5 (the joined state of the heel core 5 and the outsole 4) becomes strong and stable. The shape of the groove 7 is not necessarily limited to the shape shown in FIG. 3, and can be changed to various shapes and numbers such as a cross shape in plan view.

[0021]

[Effect of the device]

 As described in detail above, according to the shoe sole structure of the present invention, the following effects can be obtained. (1) By embedding a harder heel core in the heel portion of the outsole than in the outsole, a large difference in cooling rate can be eliminated when the outsole is formed by injection molding of a resin material, As a result, problems such as shrinkage distortion and deformation can be solved, and therefore a good shoe sole shape can be maintained. (2) By embedding the above-mentioned heel core in the heel portion, it is possible to improve the impact resistance of the heel portion and the stability of ground contact. (3) Since the heel core is attached to the insole while being attached to the insole via the elastic layer, a sufficient cushioning effect can be obtained by the elastic layer when walking, etc. Feels good. (4) In particular, when the outsole surface of the outsole has an anatomy structure, the uncomfortable feeling due to the high hardness of the heel core is mitigated by the cushioning effect of the elastic layer, so that the heel part has cushioning properties. It is not necessary to use a rich insole or insole, and the anatomy structure can be transmitted to the soles of the wearers as it is, and the extremely good characteristics of the anatomy structure can be secured.

[Brief description of drawings]

FIG. 1 is a side view showing an embodiment of a shoe sole structure of the present invention in a partial cross section.

FIG. 2 is an exploded perspective view showing the structure of the shoe sole structure of the present invention shown in FIG. 1 from the back side.

FIG. 3 is a perspective view showing a shape example of a heel core in the shoe sole structure of the present invention shown in FIG.

FIG. 4 is a cross-sectional view illustrating a manufacturing process of a shoe to which the shoe sole structure of the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cover 2 Insole 3 Adhesion between cover and insole 4 Bottom 4a Heel part 5 Heel core 6 Elastic layer

Claims (2)

[Scope of utility model registration request] 1. A shoe sole structure for an injection-molded shoe, wherein a sole including a heel portion is integrally formed, wherein a heel core harder than the sole is embedded in the heel portion. A shoe sole structure, wherein the core is attached to the bottom surface of the insole via an elastic layer. 2. The shoe sole structure according to claim 1, wherein the foot contact surface of the outsole has an anatomy structure.