JP2005013718A - Sole structure for shoe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sole structure for a shoe which can increase flexibility by allowing the bending operation of a forefoot region to bend a sole body directly. <P>SOLUTION: A hard elastic body 10 having a longitudinally extending cavity 13 formed therein is provided mainly at a forefoot region F of a sole body. The cavity 13 is formed of a first curved surface 11 extending curvedly in a longitudinal direction and a second curved surface 12 disposed under the first curved surface 11 and extending curvedly in a longitudinal direction as well. A front and rear end of the second curved surface 12 is connected to a front and rear end of the first curved surface 11 respectively and an intermediate portion of the second curved surface 12 is spaced apart downward from an intermediate portion of the first curved surface 11. A path PQ<SB>1</SB>between the front and rear end of the first curved surface 11 is substantially equal to a path PQ<SB>2</SB>between the front and rear end of the second curved surface 12. When the first curved surface 11 is pressed downward, the sole body is deformed in such a way that a rear foot region R of the sole body is lifted upward. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a sole structure of a shoe, and more particularly to an improvement in flexibility of a sole forefoot.

  In general, the sole of a shoe is made of a soft elastic member to ensure cushioning, but the forefoot part of the sole requires more flexibility in order to smoothly kick the foot during running. Is done. Therefore, conventionally, it has been attempted to improve the flexibility of the sole forefoot by reducing the thickness of the sole forefoot to some extent or by forming a bending groove in the width direction in the sole forefoot.

  However, in the conventional sole structure, when the forefoot part of the foot bends, the bending action of the forefoot part of the foot indirectly propagates to the sole forefoot part through the upper part of the shoe. The bending operation of the forefoot portion of the foot is not configured to bend the forefoot portion of the sole directly.

  The problem to be solved by the present invention is to provide a novel sole structure for a shoe which is configured so that the bending motion of the forefoot portion of the foot directly bends the sole body. In other words, an object of the present invention is to provide a sole structure for shoes having improved flexibility.

  The sole structure of the shoe according to the invention of claim 1 has a flat gap in the forefoot region of the sole body. The gap is composed of first and second curved surfaces formed of an elastic material with leading and trailing ends connected to each other and an intermediate portion spaced apart in the vertical direction. The distance between the front and rear ends of the first curved surface is substantially equal to the distance between the front and rear ends of the second curved surface, and the first curved surface is pressed downward, so that a gap is formed in the sole body. The sole body is deformed so that the rear region is lifted upward.

  According to the invention of claim 1, when the stepping portion of the forefoot portion of the sole body is pressed downward prior to the bending operation of the forefoot portion of the wearer's foot, the first curved surface is caused by the pressing load. The sole body is deformed so as to approach the second curved surface, and the sole body is bent and deformed so that the rear region of the gap in the sole body, for example, the rear foot region is lifted upward.

  In this case, since the sole body is bent by detecting the bending of the forefoot portion of the wearer's foot, the bending of the forefoot portion of the foot can be smoothly propagated directly to the sole body. In other words, the weight of the wearer and the bending of the sole body can be linked. Thereby, the flexibility of the sole body can be improved.

  In this case, since the sole body is bent while the gap between the first and second curved surfaces is reduced, wrinkles are not easily generated on the upper surface of the sole body when the sole body is bent. In addition to preventing leg and shoe rubbing from occurring on the foot, it is possible to reduce elongation when the outsole is deformed when the sole body is bent, thereby preventing peeling of the outsole.

  According to a second aspect of the present invention, in the first aspect, the gap formed by the first and second curved surfaces has a substantially parallelogram shape when viewed from the side surface direction.

  According to a third aspect of the present invention, in the first aspect, an elastic body having a gap inside and harder than the sole body is provided in the forefoot region of the sole body.

  According to a fourth aspect of the present invention, in the third aspect, the elastic body includes an upper region including the first curved surface and a lower region including the second curved surface, and the front end portion of the upper region is the rear end side. The bending rigidity is lower than that of the portion, and the rear end side portion of the lower region is lower in bending rigidity than the front end side portion.

  In this case, if the pressing load acts on the distal end portion which is the low rigidity portion of the first curved surface during the bending operation of the forefoot portion of the foot, the distal end portion of the first curved surface easily deforms downward. Then, while approaching the second curved surface side, the rear end side portion which is the low rigidity portion of the second curved surface easily deforms upward. Thereby, the degree of wearer's weight and the bending of the sole body can be interlocked, and the flexibility of the sole body can be improved.

  In this case, since the bending position of the sole body is offset backward from the position where the pressing load is applied from the front foot portion of the foot, the grip surface of the sole body with respect to the ground contact surface (road surface) can be enlarged. , Can improve the grip when kicking out.

  According to the invention of claim 5, in claim 4, the thickness of the tip end portion of the upper region is thinner than the rear end portion, and the thickness of the tail end portion of the lower region is thinner than the tip end portion. That is, in this case, the bending rigidity is changed by changing the thickness of the entire region.

  In the invention of claim 6, in claim 4, a groove or a through-hole is formed in the lower end of each of the top end portion and the rear end side portion of the upper region and the lower region, or the bending stiffness is formed. Ribs are formed on the higher side. That is, in this case, the bending rigidity is changed by locally changing the thickness of each region.

  In the invention of claim 7, in claim 4, the rear end side portion of the upper region and the front end side portion of the lower region contain FRP (fiber reinforced plastic) containing carbon fiber, glass fiber, aramid fiber and the like. .

  According to an eighth aspect of the present invention, in any one of the fourth to seventh aspects, the rear end portions of the upper region and the lower region of the elastic body integrally extend behind the rear ends of the first and second curved surfaces. The rear end of the extended portion extends to the buttocks region of the sole body.

  In this case, since the extending portion is provided in the elastic body, the space rear region, for example, the rear foot region in the sole body is easily lifted upward during the bending operation of the front foot portion of the wearer's foot. Thus, the bending of the forefoot portion of the foot can be more smoothly propagated to the sole body, and the flexibility of the sole body can be further improved.

  In a ninth aspect of the present invention, in any one of the first to third aspects, the reinforcing member for increasing the rigidity in the width direction of the sole body or the elastic body is a gap portion between the first curved surface and the second curved surface. Is provided. By this reinforcing member, it is possible to prevent the gap portion from being inadvertently deformed and crooked.

  According to a tenth aspect of the present invention, in the ninth aspect, the reinforcing member is composed of at least one rib disposed on the second curved surface and extending substantially in the width direction. In this case, when each rib is disposed along the bending line of the forefoot portion of the foot, the forefoot portion is easily bent between the adjacent ribs. The navigating effect can be demonstrated.

  According to an eleventh aspect of the present invention, in the first aspect, the plate-shaped first plate having the first curved surface and the second curved surface are connected to the front and rear ends of the first plate. An elastic structure composed of a plate-like second plate is provided in the forefoot region of the sole body.

  The sole structure of the shoe according to the invention of claim 12 has a flat gap in the forefoot region of the sole body. The gap is composed of first and second curved surfaces formed of an elastic material with leading and trailing ends connected to each other and an intermediate portion spaced apart in the vertical direction. When the forefoot region of the sole body is bent, the bending stiffness of the forefoot region changes in two stages from the first bending stiffness to the second bending stiffness as the bending progresses.

  In the invention of claim 12, when the first curved surface is deformed so as to approach the second curved surface during the bending operation of the forefoot portion of the wearer's foot, the bending rigidity of the forefoot region of the sole body is Since the first bending rigidity changes to the second bending rigidity in two stages, the flexibility of the sole body can be improved.

  In the invention of claim 13, in claim 7, when the gap is substantially closed, the first bending rigidity is changed to the second bending rigidity.

  That is, in this case, when the sole body is bent, the first bending rigidity is the first until the first curved surface comes into contact with the second curved surface, and the first curved surface comes into contact with the second curved surface. The second bending stiffness is when both curved surfaces are integrated. The second bending rigidity is considerably larger than the first bending rigidity when the air gap is formed, and acts substantially like a rigid body against the deformation of the sole body.

  For this reason, when the bending of the sole body proceeds and the first curved surface comes into contact with the second curved surface, the sole body hardly bends and deforms any more, and the sole body kicks the ground contact surface in the substantially rigid state. It will move to operation. Thereby, what is called snappy at the time of kicking can be improved.

  The sole structure of the shoe according to the fourteenth aspect of the invention has a flat gap in the forefoot region of the sole body. The gap is composed of a first curved surface and a second curved surface formed of an elastic material, each including a downwardly convex curve, the leading and trailing ends being connected to each other and the middle portion being spaced apart in the vertical direction. ing. Then, when the first curved surface is pressed downward, the sole body is deformed so that the rear region of the gap in the sole body, for example, the rear foot region is lifted upward.

  In the invention of claim 14, when the first curved surface is deformed so as to approach the second curved surface during the bending operation of the forefoot portion of the wearer's foot, for example, the rear foot region in the sole body is The sole body is deformed so as to be lifted upward. Thereby, the bending of the forefoot portion of the foot is smoothly propagated directly to the sole body, and the flexibility of the sole body is improved.

  According to a fifteenth aspect of the present invention, in any one of the first to third, ninth, twelfth to fourteenth aspects, an elastic member softer than the sole body (for example, a foam such as a sponge) is inserted into at least a part of the gap. .

  In this case, by appropriately varying the foaming rate and insertion position of the soft elastic member inserted into the gap, the first and second curved surfaces can be elastically deformed, the restoring speed after elastic deformation, etc. The manner of deformation of the second curved surface can be adjusted.

  According to a sixteenth aspect, in the fifteenth aspect, the elastic member is composed of a plurality of members each extending substantially in the width direction.

  In the invention of claim 17, in any one of claims 1, 12, or 14, the lower surface of the sole body constitutes a sole grounding surface.

  In this case, the deformation of the lower surface of the sole body appears as it is as the deformation of the sole ground surface, and the bending operation of the forefoot portion of the foot can bend the sole ground surface more directly.

  According to an eighteenth aspect of the present invention, in any one of the first, twelfth, or fourteenth aspects, the first and second curved surfaces are disposed so as to cross the heel portion of the wearer's foot in the front-rear direction.

  In this case, for example, when a load is applied to the heel portion of the foot, the rear end portion of the sole stepping portion can be deformed so as to be lifted upward. An effective sole structure can be realized for running shoes on which a load acts.

  According to a nineteenth aspect of the present invention, in any one of the first, twelfth, and fourteenth aspects, the first and second curved surfaces are disposed so as to cross the first calcaneal phalanx of the wearer's foot laterally. Yes.

  In this case, the first and second curved surfaces are disposed so as to cross the first heel proximal phalanx of the wearer's foot in the lateral direction, so that, for example, a pressing load is applied to the sole body from the first heel of the foot. When this occurs, the second curved surface can be deformed so as to promote the movement of the first heel around the inner shell side, so that the load movement to the sole edge portion can be performed smoothly and Thus, it is possible to realize a sole structure suitable for a golf shoe that requires movement of the first heel around the inner shell side.

  According to a twentieth aspect of the present invention, in any one of the first, twelfth, and fourteenth aspects, the first and second curved surfaces are disposed so as to transversely cross the fifth calcaneal phalanx of the wearer's foot. Yes.

  In this case, the first and second curved surfaces are disposed so as to cross the fifth heel phalanx of the wearer's foot in the lateral direction, so that, for example, a pressing load is applied to the sole body from the fifth heel of the foot. Since the second curved surface can be deformed so as to suppress the movement of the fifth heel around the outer side when the sway acts, the outer shell of the sole body against the lateral movement as in the side step. A stopper wall that suppresses sinking to the side can be formed on the outer side, and a sole structure suitable for tennis shoes and basketball shoes can be realized.

  According to a twenty-first aspect of the present invention, in any one of the first to third, ninth, twelfth to fourteenth aspects, the gap penetrates the sole body in the shoe width direction. In this case, the flexibility of the entire sole body in the width direction can be improved.

  As described above, according to the present invention, a flat-shaped space formed of an elastic material and extending in a curved shape and including a first curved surface and a second curved surface is provided in the forefoot region of the sole body, and the first curved surface The distance between the front and rear ends is substantially equal to the distance between the front and rear ends of the second curved surface so that the rear region of the gap is lifted upward in the sole body when the first curved surface is pressed downward. Since the sole body is deformed, it is possible to provide a novel shoe sole structure configured such that the bending motion of the forefoot portion of the foot directly bends the sole body.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
[ First embodiment ]
1 to 5 are views for explaining a sole structure according to a first embodiment of the present invention. FIG. 1 is a side view of the sole structure, and FIG. 2 is an enlarged view of a gap in the sole structure. 3 is an enlarged view of an elastic body having a gap, FIG. 4 is a side view showing a state where the sole structure is bent, and FIG. 5 is a side view showing a state where the bending of the sole structure is further advanced from the bent state of FIG. FIG.

  As shown in FIG. 1, the shoe sole structure 1 includes a sole main body forefoot portion 2 mainly disposed in the forefoot region F, and a sole disposed from the buttocks region H to the middle foot region M. A sole body having a body collar 3 is provided. An outsole 4 that is in contact with the ground contact surface G is fixed to the lower surface of the sole body. Here, the heel region H and the middle foot region M of the sole structure 1 are referred to as the rear foot region R.

  The sole body is made of, for example, a thermoplastic resin foam such as ethylene-vinyl acetate copolymer (EVA), a thermosetting resin foam such as polyurethane (PU), or a rubber material such as butadiene rubber or chloroprene rubber. It is composed of a soft elastic member such as a foam.

  An elastic body 10 having a flat-shaped gap 13 extending in the front-rear direction therein is provided mainly in the forefoot region F of the sole structure 1. The elastic body 10 is preferably formed of an elastic member that is harder than the sole body. For example, a thermoplastic resin such as thermoplastic polyurethane (TPU), polyamide elastomer (PAE), ABS resin, or an epoxy resin or non-elastic material. It is comprised from thermosetting resins, such as saturated polyester resin.

The gap 13 of the elastic body 10 is preferably a through-hole penetrating the elastic body 10 in the shoe width direction (perpendicular to the plane of FIG. 1), and as shown in FIG. It is composed of a curved surface 11 and a second curved surface 12 which is arranged below and similarly extends in a curved shape in the front-rear direction. The front and rear ends of the first and second curved surfaces 11 and 12 are connected at points P and Q, respectively, and intermediate portions between the points P and Q are spaced apart from each other. The distance between points P and Q of the first curved surface 11, that is, the distance PQ ₁ measured along the first curved surface 11, is the distance between points P and Q of the second curved surface 12, that is, along the second curved surface 12. the distance PQ ₂ as measured Te are substantially equal.

  The first curved surface 11 includes a substantially straight flat surface or a gently curved curved surface extending from the front end side to the rear end side, and a downwardly convex curved surface disposed on the rear end side. It is out. The second curved surface 12 includes an upward convex curved surface disposed on the front end side, and a downward convex gentle curved surface extending from the front end side to the rear end side.

  As shown in FIG. 3, the elastic body 10 includes an upper region 10 </ b> A including the first curved surface 11 and a lower region 10 </ b> B including the second curved surface 12. The bending rigidity of the front portion 10Af of the upper region 10A is lower than that of the rear portion 10Ar of the upper region 10A, and the bending rigidity of the front portion 10Bf of the lower region 10B is lower than the rear portion 10Br of the lower region 10B. The bending stiffness is higher.

  More specifically, as shown in FIG. 3, the thickness of the front portion 10Af of the upper region 10A is thinner than the thickness of the rear portion 10Ar of the upper region 10A, and the front side of the lower region 10B. The thickness of the portion 10Bf is thicker than the thickness of the rear portion 10Br of the lower region 10B. That is, in this case, the bending rigidity is changed by changing the thickness of the entire region.

  Although not shown, a groove or a through hole may be formed in a portion where the bending rigidity is lowered, or a rib may be formed in a portion where the bending rigidity is increased. That is, in this case, the bending rigidity is changed by locally changing the thickness of each region.

  The rear portions 10Ar and 10Br of the upper region 10A and the lower region 10B of the elastic body 10 extend integrally behind the rear ends of the first and second curved surfaces 11 and 12, and the extended portion 10C. The rear end extends to the buttocks region H of the sole body (see FIG. 1).

Next, the function and effect of the present embodiment will be described with reference to FIGS.
Prior to the bending operation of the forefoot portion of the wearer's foot, when the stepping portion of the forefoot region F of the sole structure 1 is pressed downward, the first curved surface 11 is caused by the pressing load W (FIG. 1). Is deformed so as to approach the second curved surface 12 and bends downward (see FIG. 4). As a result, the sole structure 1 is bent and deformed so that the rear foot region R of the sole structure 1 is lifted upward (see FIG. 4).

  In this case, since the sole structure is bent by detecting the bending of the front foot portion of the wearer's foot, the bending of the front foot portion of the foot can be smoothly and directly propagated to the sole structure. In other words, the weight of the wearer and the bending of the sole structure can be linked. Thereby, the flexibility of the sole structure can be improved.

  Moreover, in this case, the front portion 10Af of the upper region 10A of the elastic body 10 has a lower bending rigidity than the rear portion 10Ar, and the rear portion 10Br of the lower region 10B has a lower bending rigidity than the front portion 10Bf. Therefore, when the pressing load W acts on the front portion 10Af, which is a low rigidity portion of the upper region 10A of the elastic body 10, during the bending operation of the front foot portion of the foot, the front portion 10Af is easily deformed downward, The front portion of the first curved surface 11 approaches the second curved surface 12 side, and the rear portion 10Br, which is a low rigidity portion of the lower region 10B, is easily deformed upward. Thereby, the bending of the forefoot portion of the foot can be more smoothly propagated to the sole structure, and the flexibility of the sole body can be improved.

  Further, in this case, the bending position of the entire sole structure is offset backward with respect to the position where the pressing load W is applied from the forefoot portion of the foot, and therefore the sole structure with respect to the ground contact surface (road surface) G The grip surface can be enlarged, and the grip power when kicking out can be improved.

  Further, since the sole structure is bent while the gap 13 between the first and second curved surfaces 11 and 12 is reduced, wrinkles are hardly generated on the upper surface of the sole body when the sole structure is bent. As a result, it is possible to prevent the leg of the wearer from being rubbed and the shoe from rubbing, and to reduce the elongation when the outsole 4 is deformed when the sole structure is bent, thereby preventing the outsole 4 from being peeled off. it can.

  Next, in the state shown in FIG. 4, the gap 13 between the first and second curved surfaces 11 and 12 is substantially closed, and when the sole structure is further bent from this state, As shown by the solid line, the upper region 10A and the lower region 10B of the elastic body 10 are integrally deformed. In addition, the dotted line in FIG. 5 has shown the state of FIG.

  Therefore, the bending rigidity (first bending rigidity) of the elastic body 10 in the state of FIGS. 1 to 4 is different from the bending rigidity (second bending rigidity) of the elastic body 10 in the states of FIGS. 4 to 5. In other words, the elastic body 10 and thus the sole structure change from the first bending rigidity to the second bending rigidity in two stages as the bending progresses. Note that the second bending rigidity is considerably larger than the first bending rigidity when the gap 13 is formed, and the first bending rigidity is changed to the second bending rigidity when the sole structure is bent. When transitioning, the elastic body 10 acts almost like a rigid body against deformation of the sole structure. Thereby, what is called snappy at the time of kicking can be improved.

In the first embodiment, as described above, the distance PQ ₁ between the points P and Q of the first curved surface 11, that is, the distance PQ ₁ measured along the first curved surface 11 is the second curved surface 12. When the distance between the points P and Q, that is, the distance PQ ₂ measured along the second curved surface 12, is substantially equal, that is, PQ ₁ = PQ ₂
However, the application of the present invention is not limited to this, and the present invention is similarly applied to the case of PQ1 ≠ PQ2 (that is, PQ ₁ <PQ ₂ and PQ ₁ > PQ ₂ ). it can.

In this case, for example, in the case of PQ ₁ <PQ ₂ , the first curved surface 11 after the elastic deformation is caused by the elastic elongation of the portion between the points P and Q of the first curved surface 11 when the first curved surface 11 is deformed. The path between the points P and Q of the curved surface 11 may be substantially equal to the path between the points P and Q of the second curved surface 12.

[ Second Embodiment ]
6 and 7 are views for explaining a sole structure according to a second embodiment of the present invention, in which FIG. 6 is a side view of the sole structure, and FIG. 7 is a state in which the sole structure is bent. FIG. In these drawings, the same reference numerals as those in the first embodiment denote the same or corresponding parts.

  As shown in FIG. 6, in the second embodiment, an elastic block (for example, foam such as sponge) 20 that is softer than the sole body 2 is inserted into at least a part of the gap 13 of the elastic body 10. This is different from the first embodiment.

  In this case, the amount of elastic deformation of the first and second curved surfaces 11 and 12 and the restoring speed after elastic deformation, etc. are appropriately changed by varying the foaming rate and insertion position of the elastic block 10 inserted into the gap 13. The deformation method of the first and second curved surfaces 11 and 12 can be adjusted. FIG. 7 shows an example in which the first and second curved surfaces 11 and 12 are elastically deformed to the same extent as in FIG. 4 of the first embodiment.

[ Third embodiment ]
FIG. 8 shows an elastic structure constituting a sole structure according to a third embodiment of the present invention. In the figure, the same reference numerals as those in the first and second embodiments denote the same or corresponding parts.

  In the first and second embodiments, the example in which the elastic body 10 having the gap 13 formed by the first and second curved surfaces 11 and 12 is provided is shown. As shown in FIG. 8, an elastic structure formed by connecting both ends of first and second plates 10A ′ and 10B ′ in the form of strips is used. That is, in this case, the first curved surface 11 is configured by the inner surface of the first plate 10A ', and similarly, the second curved surface 12 is configured by the inner surface of the second plate 10B'.

  This elastic structure is preferably composed of a single loop member in which the first and second plates 10A 'and 10B' are integrally formed. In addition, this elastic structure is comprised from the raw material similar to the elastic body 10 in the said 1st, 2nd Example. Also in this case, in order to make the rigidity of the front and rear portions of the first and second plates 10A ′ and 10B ′ different, the plate thickness is changed as in the first embodiment. Or a groove, a through-hole, or a rib may be formed. Or you may make it vary locally the rigidity of the mid sole in which this elastic structure is inserted.

[ Fourth embodiment ]
In the first to third embodiments, the example in which the outsole 4 is provided on the bottom surface of the elastic body 10 or the second plate 10B ′ is shown. However, the bottom of the elastic body 10 or the second plate 10B ′ is shown. At least a part may constitute a sole ground plane.

  In this case, the deformation of the second curved surface 12 appears as it is as the deformation of the sole contact surface, and the bending operation of the forefoot portion of the foot can bend the sole contact surface more directly.

[ Fifth embodiment ]
9A and 9B show an elastic structure constituting a sole structure according to a fifth embodiment of the present invention. In the figure, the same reference numerals as those in the third embodiment denote the same or corresponding parts.

  This elastic structure is configured by connecting both ends of the plate-like first and second plates 10A 'and 10B' as in the third embodiment. In this case, the connecting portion on the front side (right side in the figure) of each plate 10A ', 10B' is formed integrally with each plate. Each plate 10A ', 10B' extends rearward (leftward in the figure), and a rear side connecting portion is constituted by a connecting portion 5 that connects the plates at the rear side portion of each plate. Therefore, in this case, the points P and Q on the first and second curved surfaces 11 and 12 are arranged at positions as shown in FIG. 9A.

  In the fifth embodiment, the gap formed by the first curved surface 11 on the inner surface of the first plate 10A ′ and the second curved surface 12 on the inner surface of the second plate 10B ′ is substantially parallel as viewed from the side surface direction. It is formed in a quadrilateral shape. That is, in this case, the distances between the points P and Q measured along the first and second curved surfaces 11 and 12 are substantially equal.

  Furthermore, in the fifth embodiment, the hatched area of the rear end portion of the first plate 10A ′ and the hatched area of the front end portion of the second plate 10B ′ include carbon fibers, glass fibers, aramid fibers, and the like. Reinforced by FRP (fiber reinforced plastic) sheets 14 and 15. When each plate including such an FRP sheet is molded, the molten resin may be introduced into the mold with the FRP sheet inserted into the mold. By providing the FRP sheet inside the elastic structure, the rigidity of a desired portion of the elastic structure can be increased.

Further, in this case, as shown in FIG. 9A, the front end portion of the or increasing the thickness t ₁ of the 'midsole 2 at the rear end portion of the' first plate 10A, a second plate 10B ''by or increasing the thickness t ₂ of the midsole 2 in the respective area portion' midsole 2 it is possible to locally up rigidity.

[ Sixth embodiment ]
10A to 10C show an elastic structure constituting a sole structure according to a sixth embodiment of the present invention. In each figure, the same reference numerals as those in the fifth embodiment denote the same or corresponding parts. FIG. 10B also shows a part of the foot takeoff curve (that is, the peeling curve of the sole when the foot moves away from the ground contact surface).

  In this elastic structure, one or more (seven in this case) ribs 16 are arranged on the second curved surface 12 of the second plate 10B '. Each rib 16 is made of the same material (preferably a hard elastic member) as the second plate 10B ′, extends substantially in the width direction, and has a predetermined interval in the front-rear direction (left-right direction in the figure). Arranged. Providing such ribs 16 can increase the rigidity of the elastic structure in the width direction, thereby preventing the gaps 13 from being inadvertently deformed and squashed. Although ribs can be provided on the inner surface 11 of the first plate 10A ′, the lower surface side of the midsole 2 ′ (that is, the outsole side) is used for design such as a groove formed in the outsole grounding surface. The second plate 10B ′ tends to be deformed more easily than the first plate 10A ′ on the upper surface side of the midsole 2 ′. For this reason, as shown in FIG. 10A, the second plate 10B ′ Providing the rib can effectively improve the rigidity of the elastic structure.

  In this case, as shown in FIG. 10B, the ribs 16 are arranged along the separation lie Lc of the forefoot part of the foot, so that the forefoot part is easily bent between the adjacent ribs 16. Thus, the weight shift during walking or running is navigated by the ribs 16, and the foot navigating effect can be exhibited.

  Each rib 16 only needs to extend at least substantially in the width direction, and may be a member extending linearly in the width direction.

  In addition, as shown in FIG. 10C, cuts 16c may be formed on the lower surface of the second plate 10B 'so as to correspond to the locations where the ribs 16 are disposed. In this case, it is possible to improve the flexibility by the cuts 16 c while securing a certain degree of rigidity by the ribs 16.

[ Seventh embodiment ]
11A and 11B show an elastic structure constituting a sole structure according to a seventh embodiment of the present invention. In each figure, the same reference numerals as those in the sixth embodiment denote the same or corresponding parts.

  In this elastic structure, a plurality of protrusions 17 made of a soft elastic member (for example, foam such as sponge) are disposed on the second curved surface 12 of the second plate 10B '. Each protrusion 17 extends substantially in the width direction, and is disposed at a predetermined interval in the front-rear direction (left-right direction in the figure).

  In this case, as compared with the case where a single elastic block is provided as in the second embodiment, finer adjustment can be made with respect to the elastic deformation of the first and second curved surfaces 11 and 12. Become.

[ Eighth embodiment ]
12A and 11B show an elastic structure constituting a sole structure according to an eighth embodiment of the present invention. In each figure, the same reference numerals as those in the sixth embodiment denote the same or corresponding parts.

  In this elastic structure, the protrusions 18 made of a soft elastic member are disposed on the second curved surface 12 of the second plate 10B ′. A plurality of grooves 18a are formed that extend in the width direction and are arranged at predetermined intervals in the front-rear direction (left-right direction in the figure).

  In this case, as compared with the case where a single elastic block is provided as in the second embodiment, finer adjustment can be made with respect to the elastic deformation of the first and second curved surfaces 11 and 12. Become.

[ Ninth embodiment ]
FIGS. 13 to 16 schematically show examples in which the upper region 10A and the lower region 10B constituting the elastic body 10 of the sole structure according to the present invention are applied to actual shoes. Here, the elastic body 10 of the first embodiment is used in each shoe, and the same reference numerals as those in the first embodiment denote the same or corresponding parts in each figure. Moreover, in each figure, while the arrangement | positioning position and arrangement | positioning direction of the elastic body 10 are represented by line segment DE, the side view of the elastic body seen from the arrow direction between line segments DE is also combined with the figure. Show.

  FIG. 13 shows a running shoe in which the upper region 10A and the lower region 10B are disposed at positions that cross the heel portion of the wearer's foot in the front-rear direction. In this case, when a load is applied from the heel portion of the foot and the front portion 10Af of the upper region 10A is deformed downward, the rear portion 10Br of the lower region 10B is deformed upward, so that the sole forefoot The rear end portion of the part is deformed so as to be lifted upward. As a result, it is possible to realize a sole structure effective for a running shoe in which a load acts repeatedly on the heel portion of the foot.

  FIG. 14 shows that, in a creat shoe in which four spikes 25 are provided on the forefoot portion of the sole, the upper region 10A and the lower region 10B are arranged at positions that cross the heel portion of the wearer's foot in the front-rear direction. It shows what was installed. In this case, the rear end portion of the sole forefoot is deformed so as to be lifted upward during the load movement, so that the load movement between the spikes in the front-rear direction can be performed smoothly.

  FIG. 15 shows a golf shoe in which an upper region 10A and a lower region 10B are disposed so as to cross the first phalanx of the wearer's foot in the lateral direction. In this case, when a load is applied from the first heel of the foot, the lower region 10B is deformed so as to promote the movement of the first heel around the inner shell side, so that the load is smoothly moved to the sole edge portion. Thus, it is possible to realize a sole structure suitable for a golf shoe that requires a movement of the first heel of the foot toward the inner shell at the time of impact.

  FIG. 16 shows a tennis shoe or a basketball shoe in which the upper region 10A and the lower region 10B of the elastic body are disposed so as to cross the fifth phalanx of the wearer's foot laterally. . In this case, when a load is applied from the fifth heel of the foot, the lower region 10B is deformed so as to suppress the movement of the fifth heel toward the outer side. A stopper wall that suppresses the sinking of the sole body toward the outer side with respect to movement can be formed on the outer side. Thereby, a sole structure suitable for tennis shoes or basketball shoes can be realized.

1 is a side view of a sole structure according to a first embodiment of the present invention. It is an enlarged view of the space | gap in a sole structure (FIG. 1). It is an enlarged view of the elastic body in a sole structure (FIG. 1). It is a side view which shows the state which the sole structure (FIG. 1) bent. FIG. 5 is a side view showing a state where the bending of the sole structure has further advanced from the bent state of FIG. 4. It is a side view of the sole structure by the 2nd example of the present invention. It is a side view which shows the state which the sole structure (FIG. 6) bent. It is a side view of the elastic structure which comprises the sole structure by the 3rd Example of this invention. FIG. 6 is a side partial view of a sole structure according to a fifth embodiment of the present invention. FIG. 9B is a partial bottom view of the sole structure (FIG. 9A). FIG. 10 is a side partial view of a sole structure according to a sixth embodiment of the present invention. FIG. 10B is a partial bottom view of the sole structure (FIG. 10A). It is a figure which shows the modification of a sole structure (FIG. 10A). FIG. 10 is a side partial view of a sole structure according to a seventh embodiment of the present invention. FIG. 11B is a partial bottom view of the sole structure (FIG. 11A). It is a side fragmentary view of the sole structure by the 8th Example of this invention. It is a bottom surface fragmentary view of a sole structure (Drawing 12A). It is a figure which shows the foot pressure distribution from landing to taking off at the time of running with the schematic diagram of the elastic body (FIG. 3) arrange | positioned in the front-back direction. It is a figure which shows the sole top view of the creat shoes in which the stud was provided in the sole forefoot part with the schematic diagram of the elastic body (FIG. 3) arrange | positioned in the front-back direction. It is a figure which shows the foot pressure distribution at the time of the impact of a golf swing with the schematic diagram of the elastic body (FIG. 3) arrange | positioned in the width direction. It is a figure which shows the foot pressure distribution at the time of the side step of tennis or basketball with the schematic diagram of the elastic body (FIG. 3) arrange | positioned in the width direction.

Explanation of symbols

1: Sole structure

2: Sole body forefoot part 3: Sole body buttocks

10: Elastic body 10A: Upper region 10Af: Front side portion 10Ar: Rear side portion 10B: Lower side region 10Bf: Front side portion 10Br: Rear side portion 10C: Extension portion 11: First curved surface 12: Second curved surface 13: Gap

F: Forefoot region H: Hip region M: Middle foot region R: Rear foot region

G: Ground plane

W: Load

Claims (21)

A sole structure of a shoe,
It has a sole body,
In the forefoot region of the sole body, a first curved surface formed from an elastic material, a front and rear end are respectively connected to a front and rear end of the first curved surface, and an intermediate portion from the intermediate portion of the first curved surface A flat gap is formed with a second curved surface formed from an elastic material and spaced apart downward.
The path between the front and rear ends of the first curved surface is substantially equal to the path between the front and rear ends of the second curved surface, and the first curved surface is pressed downward, whereby the sole The sole body is adapted to be deformed so that the rear region of the gap is lifted upward in the body.
A sole structure of a shoe characterized by that. In claim 1,
The gap has a substantially parallelogram shape in a side view,
A sole structure of a shoe characterized by that. In claim 1,
In the forefoot region of the sole body, an elastic body that has the gap inside and is harder than the sole body is provided.
A sole structure of a shoe characterized by that. In claim 3,
The elastic body includes an upper region including the first curved surface and a lower region including the second curved surface, and a bending rigidity of a front end side portion of the upper region is a rear end side portion of the upper region. The bending rigidity of the rear end side portion of the lower region is lower than the bending rigidity of the front end side portion of the lower region.
A sole structure of a shoe characterized by that. In claim 4,
The thickness of the front end side portion of the upper region is thinner than the thickness of the rear end side portion of the upper region, and the thickness of the rear end side portion of the lower region is the tip of the lower region. It is thinner than the thickness of the side part,
A sole structure of a shoe characterized by that. In claim 4,
A groove or a through hole is formed in the lower end of the upper region and the lower region of each of the front end portion and the rear end portion, or a rib is formed in the higher bend stiffness. ing,
A sole structure of a shoe characterized by that. In claim 4,
The rear end side portion of the upper region and the front end side portion of the lower region contain FRP (fiber reinforced plastic),
A sole structure of a shoe characterized by that. In any of claims 4 to 7,
The rear end side portions of the upper region and the lower region of the elastic body extend integrally behind the rear ends of the first and second curved surfaces, and the rear ends of the extended portions are Arranged in the buttocks region of the sole body,
A sole structure of a shoe characterized by that. In any of claims 1 to 3,
A reinforcing member for increasing the rigidity in the width direction of the sole body or the elastic body is provided in the gap portion between the first curved surface and the second curved surface.
A sole structure of a shoe characterized by that. In claim 9,
The reinforcing member is composed of at least one rib disposed on the second curved surface and extending substantially in the width direction.
A sole structure of a shoe characterized by that. In claim 1,
The front foot region of the sole body has a plate-like first plate on which the first curved surface is formed, a front and rear end connected to a front and rear end of the first plate, and the second curved surface. An elastic structure composed of the formed plate-like second plate is provided,
A sole structure of a shoe characterized by that. A sole structure of a shoe,
It has a sole body,
In the forefoot region of the sole body, a first curved surface formed from an elastic material, a front and rear end are respectively connected to a front and rear end of the first curved surface, and an intermediate portion from the intermediate portion of the first curved surface A flat gap is formed with a second curved surface formed from an elastic material and spaced apart downward.
When the forefoot region of the sole body is bent, the bending stiffness of the forefoot region changes in two stages from the first bending stiffness to the second bending stiffness as the bending progresses.
A sole structure of a shoe characterized by that. In claim 12,
When the gap is substantially closed, the first bending stiffness is changed to the second bending stiffness.
A sole structure of a shoe characterized by that. A sole structure of a shoe,
It has a sole body,
In the forefoot region of the sole body, a first curved surface formed of an elastic material and including a downwardly convex curve, a front and rear end are respectively connected to a front and rear end of the first curved surface, and an intermediate portion is the first A flat gap is formed that is spaced apart from an intermediate portion of the curved surface of 1 and is composed of a second curved surface that is formed of an elastic material and includes a convex curve below,
When the first curved surface is pressed downward, the sole body is deformed such that a rear region of the gap is lifted upward in the sole body.
A sole structure of a shoe characterized by that. In any one of Claims 1 to 3, 9, 12 to 14,
An elastic member that is softer than the sole body is inserted into at least a part of the gap,
A sole structure of a shoe characterized by that. In claim 15,
The elastic member is composed of a plurality of members each extending substantially in the width direction.
A sole structure of a shoe characterized by that. In any of claims 1, 12 or 14,
The bottom surface of the sole body constitutes a sole grounding surface,
A sole structure of a shoe characterized by that. In any of claims 1, 12 or 14,
The first and second curved surfaces are disposed so as to cross the heel portion of the wearer's foot in the front-rear direction.
A sole structure of a shoe characterized by that. In any one of claims 1, 12 or 14
The first and second curved surfaces are disposed transversely across the first rib proximal phalanx of the wearer's foot;
A sole structure of a shoe characterized by that. In any one of claims 1, 12 or 14
The first and second curved surfaces are disposed transversely across the fifth calcaneal phalanx of the wearer's foot;
A sole structure of a shoe characterized by that. In any one of Claims 1 to 3, 9, 12 to 14,
The gap penetrates the sole body in the shoe width direction,
A sole structure of a shoe characterized by that.

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