JP4989933B2 - shoes - Google Patents

Description

  This invention is lightweight and excellent in shock absorption, and has an appropriate strength and restoring force against deformation such as bending and twisting, and is excellent in comfort that can be flexibly deformed while suppressing excessive bending and excessive twisting. The present invention relates to a shoe having a shoe sole.

  In recent years, various shoes with a shoe sole formed by bonding a soft elastic midsole to the upper surface of a synthetic resin outer sole to improve weight reduction and shock absorption Is popular. In a shoe having such a soft sole, in order to reduce fatigue by preventing the arch corresponding part from being over-twisted or bent, a reinforcing member called a shank is provided on the arch corresponding part. Yes.

  For example, in a shoe shown in Japanese Patent Laid-Open No. 9-238704, a shank formed in a three-dimensional shape by bending a fiber reinforced resin plate having a thickness of about 2 mm in an arch shape in the shoe width direction is a arch It is buried in.

In addition, there is already a shoe that does not embed the plate-shaped shank as described above, but affixes a fiber reinforced resin sheet to the corresponding part of the arch on the upper surface of the midsole to suppress bending deformation or twisting deformation of the part. It is commercially available.
JP-A-9-238704

  However, in a shoe having a sole structure in which the plate-shaped shank is embedded as described above, the arch can give sufficient strength to the corresponding part to suppress excessive bending and twisting deformation, but it is too hard. It becomes difficult to deform following the change in flexion of the joint part accompanying the movement of the human foot, so that the walking ability is hindered such as lifting of the heel during walking, making it difficult to walk There was a problem.

  On the other hand, in shoes with a sole structure in which a fiber reinforced resin sheet is attached to the arch of the upper part of the midsole, the foot will be deformed following the change in flexion of the joint accompanying the movement of the human foot. Although it is easy, it is difficult to obtain sufficient hardness to suppress excessive deformation such as twisting and bending on slopes and road surfaces with small unevenness, and improvement in reducing fatigue that accumulates on the arch of the sole is required It was.

  In addition, in each shoe having each of the above-mentioned sole structures, when both walk or run on a road surface where a small unevenness such as a gravel road or a cobblestone road continues, local thrust force due to the unevenness is increased. There is also a problem that the cushioning property is low and the pushing force is easily transmitted directly to the stepped portion of the sole.

  The present invention has been made in view of the above problems, and the object thereof is lightweight and excellent in shock absorption, and has an appropriate strength and restoring force against deformation such as bending and twisting. An object of the present invention is to provide a shoe that has a shoe sole that can be flexibly deformed while suppressing excessive bending and excessive twisting, and that is comfortable and can reduce fatigue as much as possible. It is another object of the present invention to provide a shoe that has a shoe sole excellent in local shock-absorbing force due to small unevenness on the road surface and that is comfortable to wear and can reduce fatigue as much as possible.

  In order to achieve the above object, according to the present invention, in a shoe having a shoe sole in which a soft elastic midsole is bonded to an upper surface of a synthetic resin outer sole, a portion corresponding to an arch on the upper surface of the midsole An upper reinforcing sheet made of a fiber reinforced resin sheet is attached to the lower sole, and a lower reinforcing sheet made of a fiber reinforced resin sheet is also interposed in a part corresponding to the arch between the midsole and the outer sole.

Here, the toe side edge of the lower reinforcement sheet extends further toward the toe side than the toe side edge of the upper reinforcement sheet, and the toes of the proximal phalanx of the second finger of the toe It is desirable to have a configuration that reaches a portion corresponding to a range extending between the two joint portions at both ends of the side end and the heel side end .

  Further, on the upper surface side of the midsole, the toe side and the heel side of the upper reinforcing sheet are positioned at two locations, and the heel part and the ball part corresponding to the toes are softer than the midsole. It is desirable to dispose a cushion material made of a foamed resin.

  According to the shoe according to the present invention, not only the upper reinforcement sheet made of a fiber reinforced resin sheet is attached to the arch corresponding portion of the upper surface of the midsole made of a soft elastic body, but also between the midsole and the outer sole. Since the lower reinforcement sheet made of fiber reinforced resin sheet is also interposed between the arch and the corresponding part, while maintaining the shock absorption in the thickness direction of the midsole, the upper surface side against the tensile force generated at the time of bending deformation or torsional deformation The strength with the lower surface side can be significantly improved. For this reason, it is excellent in strength (proof strength) and restoring force against bending deformation and torsional deformation while maintaining shock absorption, and has a suitable strength that can suppress excessive bending and excessive torsion, and flexibly deforms. It is possible to provide a shoe with a bottom that is lightweight and comfortable to wear, and that can reduce fatigue as much as possible. In addition, it becomes possible to prevent the occurrence of permanent deformation (deformation) of the part corresponding to the arch due to use over time.

In addition, the toe side edge of the lower reinforcing sheet extends to the site corresponding to the range between the two joints at both ends of the toe side end and the heel side end of the second phalanx of the toe. If it is extended toward the side, the local push-up force to the foot treading part due to the unevenness on the road surface with small unevenness such as gravel road surface or cobblestone road surface is distributed around the periphery by the lower reinforcing sheet. Can be absorbed in a large area, and fatigue can be reduced as much as possible. Further, the restoring force of the lower reinforcing sheet can return the raised shape of the toe to its original state, and can prevent the occurrence of permanent deformation (deformation) due to use over time.

  Furthermore, on the upper surface side of the midsole, the toe side and the heel side of the upper reinforcing sheet are positioned at two locations, and the heel part and the ball part corresponding to the toes are softer than the midsole. Providing comfortable shoes with excellent shock absorption and reduced fatigue as much as possible by providing cushioning material made of foamed resin that fits more flexibly by the shape of the foot part of the sole it can.

  Hereinafter, a preferred embodiment of a shoe according to the present invention will be described in detail with reference to the accompanying drawings, taking a walking shoe as an example. FIG. 1 is a rear view showing the sole of a shoe according to the present invention, FIG. 2 (a) is a left side view of FIG. 1, FIG. 2 (b) is a right side view of FIG. FIG. 4 is a longitudinal sectional view in the shoe length direction indicated by the AA line in FIG. 1, and FIG. 5 is a toe side stepping portion indicated by the BB line in FIG. 6 is a longitudinal cross-sectional view in the shoe width direction of the toe side stepped portion indicated by the line CC in FIG. 1, and FIG. 7 is indicated by the line DD in FIG. FIG. 8 is a longitudinal cross-sectional view of the arch corresponding portion shown by the EE line in FIG. 1, and FIG. 9 is a FF line in FIG. It is a longitudinal cross-sectional view of the shoe width direction of the heel shown.

  As shown in FIGS. 1 and 2, an outer sole 4 is provided on the bottom surface of the walking shoe 2, that is, on the tread surface at the time of ground contact. The outer sole 4 is made of a soft synthetic resin material. Synthetic resin materials include rubber and urethane. As shown in FIGS. 3 to 9, on the upper surface of the soft synthetic resin outer sole 4, a midsole 6 made of a soft elastic body excellent in shock absorption such as foamed polyurethane and EVA is provided. Are bonded together to form the sole 8. A rising portion 4a that rises upward and protrudes upward from the upper surface of the midsole 6 is formed at the peripheral edge of the outer sole 4, and a lower edge portion of the upper member that is not shown in the drawing is formed on the rising portion 4a. The shoes 2 are formed by being integrally bonded.

  Here, as can be seen from FIGS. 3, 4, 5, and 6, the upper surface of the midsole 6 is a portion corresponding to the ball portion around the third joint portion of the toes located on the toe side ( A depression 9a is formed in the stepping portion), and a cushioning material 10a made of foamed resin softer than the midsole 6 is provided in the depression 9a.

  Further, as can be seen from FIGS. 3, 4, and 9, the upper surface of the midsole 6 has a recess 9b formed in a portion corresponding to the heel located on the heel side. A cushioning material 10b made of foamed resin that is softer than the midsole 6 is provided.

  As can be seen from FIGS. 2 and 4, the arch corresponding portion 12 of the shoe sole 8 composed of the midsole 6 and the outer sole 4 is formed in an arch shape with the lower surface side recessed upward. And the upper reinforcement sheet | seat 14 which consists of a fiber reinforced resin sheet is affixed on the upper surface of the midsole 6 in this arch-shaped arch corresponding part 12 as shown in FIG.3, FIG.4, FIG.7 and FIG. Yes. That is, in this embodiment, as shown in FIGS. 3 and 4, the upper reinforcing sheet 14 is disposed only in a range from the toe side end portion to the heel side end portion of the arch corresponding portion 12, The cushion material 10a is located at two locations on the toe side and the heel side of the upper reinforcing sheet 14, and is disposed on the foot stepping portion between the heel portion and the ball portion corresponding to the toes.

  Here, in the present embodiment, the fiber reinforced sheet is a carbon fiber reinforced sheet, specifically, a woven fabric (cross) of carbon fiber is used as a reinforcing material, and a thermoplastic acrylic resin is used as a matrix and is about 0.3 mm. “Pyrofil sheet (TR3110)” manufactured by Mitsubishi Rayon Co., Ltd., which is a carbon fiber composite material formed with a thickness of 10 mm. In this embodiment, a carbon fiber reinforced resin sheet is used, but a fiber reinforced resin sheet using glass fiber, aramid fiber, Kevlar fiber, or the like can also be used. The matrix may be a thermosetting epoxy.

  As can be seen from FIGS. 3 to 8, a lower reinforcing sheet 16 made of the same material as the fiber-reinforced resin sheet is also attached to the arch corresponding portion 12 between the midsole 6 and the outer sole 4. Intervened. That is, as shown in FIGS. 4, 7, and 8, the arch corresponding portion 12 of the midsole 6 has two fiber reinforced resins whose upper and lower surfaces are an upper reinforcing sheet 14 and a lower reinforcing sheet 16. It has a sandwich structure sandwiched between sheets. In this embodiment, the upper reinforcing sheet 14 and the lower reinforcing sheet 16 are made of fiber reinforced resin sheets made of the same material. However, fiber reinforced resin sheets made of different materials may be used in combination.

As shown in FIGS. 3 and 4, the lower reinforcing sheet 16 has a toe side end edge 16 a that extends further toward the toe side than the toe side end edge 14 a of the upper reinforcing sheet 14. Thus, it reaches the stepping site corresponding to the range between the two joints at both ends of the toe side end and the heel side end of the proximal phalanx of the second toe of the toe.

Here, as shown in FIG. 3, the stepping parts corresponding to the range between the two joints at both ends of the toe side end and the heel side end of the proximal phalanx of the second finger are various types. For each shoe size, if each reference foot length is 1, the length of the foot side l is 75 to 90% (0.75 l to 0.9 l) with the heel side end as a reference point. It is set so that the toe side edge 14a of the lower reinforcing sheet 16 is located within the range. Further, the heel side edge 16b of the lower reinforcing sheet 16 is set so as to be located within a range of 30 to 45% in length (0.3 l to 0.45 l) with the heel side end as the reference point. . The range corresponds to a range of a portion corresponding to about 1/3 of the rib toe side and a portion corresponding to the toe side slightly more than this when viewed in cross section. It should be noted that both the lower reinforcing sheet 16 and the upper reinforcing sheet 14 have a dimension in the foot width direction of 35% or more of each part width dimension at the portion where they are adhered, or a stepping part corresponding part of 50% or more. The arch-corresponding portion 12 is set to 35% or more.

  Further, in the present embodiment, as shown in FIG. 1, a window portion 18 is formed in the arch corresponding portion 12 of the outer sole 4 so that the lower reinforcing sheet 16 can be visually recognized. A transparent protective cover member 20 that covers the surface of the lower reinforcing sheet 16 is attached.

  Therefore, in the shoe 2 of the present embodiment configured as described above, as shown in FIGS. 3 and 4, the fiber reinforced resin sheet is applied to the arch corresponding portion of the upper surface of the midsole 6 made of a soft elastic body. Since the upper reinforcing sheet 14 is attached and provided, the arch between the midsole 6 and the outer sole 4 is also provided with the lower reinforcing sheet 16 made of a fiber reinforced resin sheet interposed therebetween. In addition, while maintaining the shock absorption in the thickness direction of the midsole 6, the strength of the upper surface side and the lower surface side against the tensile force generated when the midsole 6 is bent or twisted can be remarkably improved. For this reason, it is possible to improve the strength (proof strength) and the restoring force against bending deformation and torsional deformation while maintaining the shock absorption, and it has an appropriate strength that can suppress excessive bending and excessive twisting. A shoe sole that deforms into a shape is obtained. Therefore, it is possible to provide a shoe 2 that is lightweight and comfortable to wear and that can reduce fatigue as much as possible. In addition, it becomes possible to prevent the arch arch corresponding portion 12 from being permanently deformed (deformed) due to use over time.

Further, as shown in FIGS. 3 and 4, the toe side edge 16a of the lower reinforcing sheet 16 is provided at the two ends of the toe side end and the heel side end of the second phalanx of the toe. Since it is extended toward the toe side to the foot stepping part corresponding to the range spanning between the joints, the foot stepping part by the unevenness on the road surface with small unevenness such as gravel road surface or cobblestone road surface The local pushing-up force can be dispersed by the lower reinforcing sheet 16 and absorbed in a large area. For this reason, fatigue can be reduced as much as possible. Further, due to the restoring force of the lower reinforcing sheet 16, the shape can be restored to its original state even if it is greatly deformed so that the toes rise, and the occurrence of permanent deformation (deformation) due to use over time can be prevented. Furthermore, when kicking out during walking or the like, even if the stepped part on the toe side of the foot is bent to near 90 ° with respect to the arch, the corresponding part 12 is flexibly made to follow the bent shape change of the sole. Not only can the shoe sole 8 be deformed, but the restoring force of the deformation can be used as a kicking force in the forward direction to support walking.

  Further, as shown in FIGS. 3 and 4, on the upper surface side of the midsole 6, the toe side and the heel side of the upper reinforcing sheet 14 are positioned at two places, the heel part and the toe ball. Since the cushioning material 10a, 10b made of foamed resin that is softer than the midsole 6 is disposed in the portion corresponding to the part, the midsole 6 is fitted more flexibly to the shape of the stepped part of the sole, It is possible to further improve the shock absorption and reduce the degree of fatigue as much as possible, and to make the shoe 2 comfortable.

  The present invention can be applied not only to the walking shoes described in the above embodiments, but also to everyday town use shoes and jogging shoes, as well as to a wide variety of sports items such as golf shoes, tennis shoes, and badminton shoes. The range of use is wide.

The back view which shows the shoe sole of the shoes which concern on this invention. (A) is the left view of FIG. 1, (b) is the right view of FIG. The top view which shows the sole of the shoes based on this invention. The longitudinal cross-sectional view of the shoe length direction shown by the AA line in FIG. The longitudinal cross-sectional view of the shoe width direction of the toe side stepping part shown by the BB line in FIG. The longitudinal cross-sectional view of the shoe width direction of the toe side stepping part shown by the CC line in FIG. The longitudinal cross-sectional view of the arch corresponding part shown by the DD line in FIG. 1 of the shoe width direction. The longitudinal cross-sectional view of the arch corresponding part shown by the EE line in FIG. 1 of the shoe width direction. The longitudinal cross-sectional view of the shoe width direction of the heel shown by the FF line in FIG.

Explanation of symbols

2 Shoes 4 Outer sole 6 Midsole 8 Sole 10a Cushion material (toe side)
10b Cushion material (back side)
12 Corresponding part of arch 14 Upper reinforcement sheet 14a Toe side edge 14b Side edge 16 Lower reinforcement sheet 16a Toe side edge 16b Edge side edge

Claims (3)

  A shoe having a sole in which a soft elastic midsole is bonded to the upper surface of a synthetic resin outer sole, and an upper reinforcing sheet made of a fiber reinforced resin sheet is bonded to the upper surface of the midsole And a lower reinforcing sheet made of a fiber-reinforced resin sheet is also interposed in a part corresponding to the arch between the midsole and the outer sole. The toe side edge of the lower reinforcing sheet extends further toward the toe side than the toe side edge of the upper reinforcing sheet, and the toe side edge and the heel side of the proximal phalanx of the second finger of the toe The shoe according to claim 1, wherein the shoe reaches a region corresponding to a range between two joint portions at both ends of the end . On the upper surface side of the midsole, the toe side and the heel side of the upper reinforcing sheet are positioned at two locations, and the heel part and the ball part corresponding to the toes are softer than the midsole. The shoe according to claim 1, wherein a cushioning material made of foamed resin is disposed.

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