JP6480846B2 - shoes - Google Patents

Description

  The present invention relates to shoes.

  Conventionally, when the weight of the human body is applied to the sole support surface of the midsole, especially the heel support surface that supports the heel part of the foot, when the user touches the ground when running or walking as a shoe A shoe having a midsole structure for absorbing and mitigating a vertical impact generated in the vertical direction is known.

  For example, Patent Document 1 discloses a shoe having a shoe sole in which a soft elastic midsole is bonded to an upper surface of a synthetic resin outer sole, and the upper surface of the midsole is provided with a recess in a heel-corresponding portion. There is disclosed a shoe in which a cushion material made of foamed resin, which is softer than the midsole, is accommodated in the recess without any gap.

  Further, Patent Document 2 includes a shoe main body and a shoe sole, and the shoe sole is provided with a receiving portion in which the bottom surface of the shoe sole is formed in a recessed shape to a certain depth, and the buffer element is received in the receiving portion. An athletic shoe is disclosed. In addition, this accommodating part is formed in the shape matched with the buffer element in plan view, and when the load in the vertical direction is applied to the buffer element, the buffer element swells radially and allows free deformation in that direction. It is comprised so that it may have the deformation | transformation tolerance space for doing.

JP 2008-18167 A Japanese Patent Laid-Open No. 08-38211

  By the way, the main functions generally required for running shoes, walking shoes, and the like include impact relaxation, heel stability, fit, grip, and torsional rigidity. Various improvements have been made so far in order to enhance these functions, and among them, there is a demand for shoes that improve the performance of the user by improving impact relaxation. When the user wearing the shoes touches the ground during walking or running, the sole support surface (especially the heel support surface) provided on the midsole is not limited to the vertical vertical impact, but also the vertical vertical direction. It has become clear that impacts in other directions (for example, the front-rear direction and the left-right direction) occur. In other words, in order to sufficiently improve the user's feeling of touching the ground, walking comfort and running comfort, not only the impact generated vertically and vertically with respect to the heel support surface but also the impact generated in other directions are also appropriate. It is important to absorb and relax.

  However, although the shoes of Patent Documents 1 and 2 are configured so that only the shock in the vertical vertical direction generated on the heel support surface is absorbed by the cushioning body having cushioning properties, the cushioning body has no gap in the housing portion. It is housed so as not to move, and is not devised to mitigate impacts that occur in directions other than the vertical vertical direction. That is, in the midsole structure of the shoes as in Patent Documents 1 and 2, the impact relaxation property is insufficient, and as a result, it is possible to sufficiently improve the user's feeling of touching, walking and running. There was no problem.

  The present invention has been made in view of the above points, and an object thereof is to improve the user's feeling of grounding, walking and running by improving the structure of the midsole. .

  In order to achieve the above object, in the present invention, when the weight of the human body is applied to the shoe support surface of the shoe, attention is paid not only to the vertical vertical direction of the shoe but also to other directions. In addition, when the ground contact surface of the outsole contacts the road surface, the cushioning body is allowed to move relatively within the housing portion.

Specifically, the first form is a shoe including a midsole that is disposed on an upper side of an outsole having a grounding surface that contacts a road surface and supports a sole of a human body, and the midsole is a foot of a human body. A midsole body made of an elastic material extending in the front-rear direction having a sole support surface on the upper surface for supporting the sole of the foot from the fingertip side to the back of the buttocks, and a rear region of the sole support surface of the midsole body A heel support surface, wherein the foot support surface includes a storage portion formed in a concave shape toward the outsole, and a heel support surface that is received in a non-fixed state in the storage portion and supports the heel portion of the foot on the upper surface. A shock absorber made of an elastic material that absorbs a vertical vertical impact applied to the front and rear walls between the front and rear wall surfaces in the housing portion and the front and rear end portions of the shock absorber housed in the housing portion, respectively. A rear gap is provided . And when the grounding surface of the outsole is in contact with the road surface and the weight of the human body is applied to the heel support surface, the buffer body can be relatively moved in the front-rear direction by the front and rear gaps in the housing portion. It is characterized by.

  In the first embodiment, the grounding surface of the outsole is grounded to the road surface by the front and rear gaps provided between the front and rear wall surfaces in the housing portion and the front and rear end portions of the buffer body housed in the housing portion. When the weight of the human body is applied to the heel support surface, the buffer body made of an elastic material is allowed to move relative to each other in the front-rear direction within the housing portion. For this reason, not only the vertical vertical impact generated on the heel support surface is absorbed by the cushioning property of the shock absorber, but also the front-rear impact generated on the heel support surface is caused by the movement of the shock absorber in the housing portion in the front-rear direction. It will be escaped within. That is, when the ground contact surface of the outsole contacts the road surface, the impact in the vertical vertical direction and the front / rear direction generated on the heel support surface is reduced by the cushioning property and the mobility of the buffer body. As a result, it is possible to improve the feeling of grounding of the foot, the walking comfort and the running comfort of the user who wears the shoes according to the first embodiment during walking or running.

  The second mode is characterized in that, in the first mode, the front and rear gaps are in the range of 0.5 to 5.0 mm.

  In this second embodiment, the shock absorber does not move in the front-rear direction more than necessary, and sufficiently improves the feeling of grounding, walking and running when the user wearing the shoes is walking or running. Can do.

  The third form is characterized in that, in the first or second form, the width of the buffer body in the left-right direction is formed to be substantially the same as the distance between the left and right wall surfaces in the housing portion.

  In the third embodiment, the shock absorber is housed in the housing portion without a gap between the left and right wall surfaces in the housing portion and the left and right end portions of the shock absorber, and relative movement in the front-rear direction is allowed in the housing portion. In other words, the shock absorber is restricted so as not to relatively move in the left-right direction within the housing portion, so that the front-rear impact generated on the heel support surface can be concentrated in the midsole. As a result, it is possible to further improve the feeling of grounding, the walking comfort, and the running comfort of the user wearing the shoes during walking or running.

  In the fourth mode, in the first or second mode, left and right side gaps are respectively provided between the left and right wall surfaces in the storage unit and the left and right side ends of the buffer body stored in the storage unit. In addition, when the grounding surface of the outsole is in contact with the road surface and the weight of the human body is added to the heel support surface, the cushioning body can be relatively moved in the left-right direction by the left and right gaps in the housing portion. And

  In the fourth embodiment, when the ground contact surface of the outsole contacts the road surface and the weight of the human body is added to the heel support surface, the left and right wall surfaces in the storage portion and the left and right end portions of the shock absorber stored in the storage portion The shock absorber made of an elastic material is allowed to relatively move in the left-right direction within the housing portion by the left and right gaps provided between the two. For this reason, not only the vertical vertical shock generated on the heel support surface is absorbed by the cushioning property of the shock absorber, but also the front and rear and left and right shocks generated on the heel support surface are the front and rear direction and left and right of the shock absorber in the housing portion. The movement in the direction will cause it to escape in the midsole. That is, when the grounding surface of the outsole contacts the road surface, the vertical generated on the heel support surface by the cushioning property of the buffering body and the mobility of the buffering body allowed to move toward the surrounding wall surfaces in the four directions within the housing portion. Impacts in the up-down direction and the front-rear and left-right directions are reduced. As a result, it is possible to further improve the feeling of grounding, the walking comfort, and the running comfort of the user wearing the shoes during walking or running.

  The fifth embodiment is characterized in that, in the fourth embodiment, the left and right gaps are in the range of 0.5 to 5.0 mm.

  In the fifth embodiment, the shock absorber does not relatively move in the left-right direction more than necessary, and sufficiently improves the feeling of grounding, walking and running when the user wearing the shoes is walking or running. Can do.

  A sixth mode is any one of the first to fifth modes, wherein the shock absorber has a laminated structure in which thin plates made of a plurality of elastic materials are stacked one above the other. It is comprised so that it can move independently within the accommodating part.

  In the sixth embodiment, since the buffer body is a laminated structure of thin plates made of an elastic material, the amount of movement of the buffer body in the housing portion is relatively increased by the relative movement between the thin plates, and the padding support surface The resulting impact relaxation can be further enhanced.

  According to a seventh aspect, in any one of the first to sixth aspects, the buffer body is made of the same material as the midsole body.

  In the seventh embodiment, the cushioning property of the shock absorber becomes equivalent to that of the midsole body, and the impact in the vertical vertical direction generated on the sole support surface and the heel support surface can be absorbed equally as the entire midsole, You can improve your walking and running comfort without feeling uncomfortable.

  The eighth form is characterized in that, in any one of the first to sixth forms, the buffer is made of an elastic material having a specific gravity smaller than that of the midsole body or an elastic material having a lower hardness.

  In the eighth embodiment, the cushioning property of the buffer body higher than that of the midsole body makes it possible to more intensively absorb the vertical and vertical impact generated on the heel support surface among the sole support surfaces.

  As described above, according to the present invention, the cushioning and mobility imparted to the cushioning body improve the impact mitigation, and the grounding feeling and walking comfort of the user who wears the shoes while walking or running Driving comfort can be improved.

FIG. 1 is a plan view showing a sole structure of a shoe according to a first embodiment of the present invention. FIG. 2 is a view corresponding to FIG. 1 showing the structure of the foot of the human body superimposed on the sole structure of the shoe. 3 is a cross-sectional view taken along line III-III in FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. FIG. 5 is a view corresponding to FIG. 1 and showing a sole structure of a shoe according to the second embodiment. FIG. 6 is a view corresponding to FIG. 4 showing the sole structure of the shoe according to the second embodiment. FIG. 7 is a view corresponding to FIG. 4 showing a modification of the second embodiment. FIG. 8 is a diagram corresponding to FIG. 4 and shows another modification of the second embodiment. FIG. 9 is a view corresponding to FIG. 3 showing a sole structure of a shoe according to another embodiment. FIG. 10 is a view corresponding to FIG. 4 showing a sole structure of a shoe according to another embodiment. FIG. 11 is a graph showing the relationship between time and the longitudinal acceleration waveform in Example 1. FIG. 12 is a graph showing the relationship between each sample and the longitudinal acceleration in Example 2.

[First Embodiment]
Hereinafter, a first embodiment of the present invention will be described in detail with reference to the drawings. The following description of each embodiment is merely illustrative in nature, and is not intended to limit the present invention, its application, or its use.

  1 to 4 show a shoe S according to a first embodiment of the present invention, and this shoe S illustrates only a shoe for the left foot. Since the right foot shoe is configured to be bilaterally symmetric with the left foot shoe S, in the following description, only the left foot shoe S will be described, and description of the right foot shoe will be omitted. In the following description, upper (upper) and lower (lower) represent the positional relationship in the vertical direction of the shoe S, and front (front / front) and rear (rear / rear) refer to the front and rear of the shoe S. It represents the positional relationship of directions.

  As shown in FIGS. 1 to 4, the shoe S includes an outsole 1 having a ground contact surface 2 that contacts the road surface. The outsole 1 is composed of a hard elastic member having a hardness higher than that of the midsole body 4 to be described later. For example, a thermoplastic resin such as ethylene-vinyl acetate copolymer (EVA) or heat such as polyurethane (PU) is used. A curable resin or a rubber material such as butadiene rubber or chloroprene rubber is suitable. Moreover, the thickness of the outsole 1 is set to the range of 2-7 mm, for example, and a more preferable suitable range is 3-5 mm. 3 and 4, the hatching of the outsole 1 is omitted for convenience of illustration.

  Further, on the upper side of the outsole 1, a midsole 3 for supporting the soles of the human body is provided. The midsole 3 has a lower side fixed to the upper side of the outsole 1 with an adhesive or the like, and an upper (upper part) (not shown) that covers a user's foot is provided above.

  The midsole 3 has a midsole body 4 that supports the user's foot sole. As shown in FIGS. 1 and 2, on the upper surface of the midsole body 4, a sole support surface 5 that supports the back of the foot from the fingertip side of the human body to the back of the buttocks extends in the front-rear direction. Is formed. The midsole body 4 is made of a soft elastic material. For example, a thermoplastic synthetic resin such as ethylene-vinyl acetate copolymer (EVA), a foam thereof, a thermosetting resin such as polyurethane (PU), or the like. Foam, rubber materials such as butadiene rubber and chloroprene rubber, and foams thereof are suitable. The hardness of the midsole body 4 is, for example, 30C to 80C (more preferably 45C to 70C, specifically 55C) on the Asker C scale. Further, the midsole body 4 is set so that the thickness at the substantially central portion in the front-rear direction is about 12 mm, for example.

  As shown in FIGS. 1 and 2, the front and rear regions of the sole support surface 5 of the midsole body 4 have first and second buffer bodies 8 and 10 to be described later, respectively. 1 and 2nd accommodating parts 6 and 7 are provided, respectively. As shown in FIG. 3, each of the first and second accommodating portions 6, 7 is formed in a recessed shape with the sole support surface 5 of the midsole body 4 facing the lower side of the outsole 1.

  The 1st accommodating part 6 is formed in the position (namely, position corresponding to the front side of a leg | foot) corresponding to the step part of a leg | foot of a human body. Specifically, as shown in FIG. 2, the first accommodating portion 6 is centered on the boundary portion between the phalangeal portion F and the metatarsal bone portion M of the human foot while the user wears the shoes S. It is provided in the area to be.

  As shown in FIGS. 1 and 2, each of the front wall surface 6 a and the rear wall surface 6 b in the first housing portion 6 extends substantially linearly in the left-right direction. The left side wall surface 6c (the wall surface located on the outer side of the left foot shown in FIG. 2) in the first housing portion 6 is formed along the curved shape of the outer end side 4a of the adjacent midsole body 4. On the other hand, the right side wall surface 6d (the wall surface located on the inner side of the left foot shown in FIG. 2) in the first housing portion 6 is formed along the curved shape of the inner end side 4b of the adjacent midsole body 4. .

  On the other hand, the 2nd accommodating part 7 is formed in the position (namely, position corresponding to the back side of a leg | foot) corresponding to the buttocks of a human body leg. Specifically, as shown in FIG. 2, the second housing portion 7 is provided in a region where the rib H of the human body mainly comes into contact with the user wearing the shoes S.

  As shown in FIGS. 1 and 2, the front wall surface 7 a in the second housing portion 7 extends substantially linearly in the left-right direction, while the rear wall surface 7 b is the rear end side 4 c of the adjacent midsole body 4. It is formed along the curved shape. Further, the left side wall surface 7c (the wall surface positioned on the outer side of the left foot shown in FIG. 2) in the second housing portion 7 is formed linearly along the outer end side 4a of the adjacent midsole body 4. On the other hand, the right wall surface 7d (the wall surface positioned on the inner side of the left foot shown in FIG. 2) is formed so as to follow the curved shape of the inner end side 4b of the adjacent midsole body 4.

  As shown in FIGS. 3 and 4, each of the front and rear wall surfaces 7a and 7b and the left and right wall surfaces 7c and 7d has a cross section in which the second housing portion 7 has the same shape on the opening side (upper side) and the back side (lower side). Each is formed in a planar shape along the vertical direction so as to have a structure. Further, the bottom portion 7e of the second housing portion 7 is formed at a depth position corresponding to about 1/3 to half of the thickness of the rear side of the midsole body 4.

  As shown in FIG. 1 and FIG. 2, a first buffer 8 that supports a stepped portion of a human body is housed in the first housing 6. The first shock absorber 8 is formed with a stepping support surface 9 for supporting a stepped portion of a human body on the upper surface, and is made of an elastic material that absorbs a vertical vertical impact applied to the stepping support surface 9. Become. Moreover, the outer peripheral surface shape of the first buffer body 8 has a shape corresponding to the inner peripheral surface shape of the first housing portion 6, and thus, the first buffer body 8 is in relation to the first housing portion 6. It is housed without gaps. Further, the first buffer 8 is accommodated in a state where it is not fixed to the peripheral wall surfaces 6a to 6d and the bottom surface 6e of the first accommodating portion 6, that is, in a non-adhered state. In addition, as a material of the 1st buffer body 8, it is preferable to apply the same thing as the material of each thin plate 11 and 11 which comprises the 2nd buffer body 10 mentioned later.

  On the other hand, as shown in FIGS. 1 and 2, the second buffer 10 that supports the heel portion of the foot (the region including the rib H shown in FIG. 2) is housed in the second housing portion 7. . As shown in FIGS. 3 and 4, the second shock absorber 10 has a laminated structure in which two thin plates 11, 11 made of elastic material are laminated vertically, and the upper surface of the thin plate 11 disposed on the upper side. On the (upper surface of the second buffer body 10), a heel support surface 12 that supports the heel portion of the human body is formed. Here, the thin plates 11 and 11 constituting the second buffer body 10 are made of the same material as the midsole body 4.

  As shown in FIG. 4, the heel support surface 12 is curved downward so as to cover the heel portion of the human body, and the left and right end portions thereof are soles other than the second housing portion 7 of the midsole body 4. It continues smoothly to the support surface 5. That is, the second shock absorber 10 absorbs the vertical vertical impact applied to the heel support surface 12 when the ground contact surface 2 of the outsole 1 contacts the road surface and the weight of the human body is applied to the heel support surface 12. Is configured to do. Similarly to the first buffer 8, the second buffer 10 is stored in a state where it is not fixed to the peripheral wall surfaces 7 a to 7 d and the bottom surface 7 e in the second storage portion 7, that is, in a non-fixed state.

  As a feature of the present invention, as shown in FIG. 1, the front end 10 a of the second shock absorber 10 has a front wall surface 7 a of the second housing portion 7 so as to follow the linear shape of the front wall surface 7 a of the second housing portion 7. And extending in a straight line in the left-right direction at a predetermined interval. On the other hand, the rear end portion 10b of the second buffer body 10 is curved with a predetermined distance from the rear wall surface 7b of the second housing portion 7 so as to follow the curved shape of the rear wall surface 7b of the second housing portion 7. Is formed. That is, in a state where the second buffer body 10 is stored in the second storage portion 7, between the front and rear wall surfaces 7 a and 7 b in the second storage portion 7 and the front and rear end portions 10 a and 10 b of the second buffer body 10. Are provided with front and rear gaps 21 and 22, respectively. Here, each of the front and rear gaps 21 and 22 is preferably set within a range of 0.5 to 5.0 mm, and more preferably around 2.0 mm.

  When the ground contact surface 2 of the outsole 1 contacts the road surface and the weight of the human body is applied to the heel support surface 12, the second shock absorber 10 has the front and rear gaps 21, 22 enables relative movement in the front-rear direction. Further, each of the two thin plates 11, 11 constituting the second buffer body 10 is in an unfixed state, and is configured to be relatively movable in the front-rear direction independently within the second housing portion 7. Yes. In order to improve the mobility between the thin plates 11, 11, for example, a surface processing treatment (for example, a film sticking treatment), a treatment for applying a lubricating oil, or a treatment for adding a powder body such as baby powder is performed on the thin plate 11. , 11 may be applied to the contact portion between each other.

  As shown in FIG. 1, the left end portion 10 c of the second buffer body 10 is linearly formed along the left wall surface 7 c in the second housing portion 7, while the right end of the second buffer body 10 is formed. The part 10d is formed in a curved shape so as to follow the right wall surface 7d in the second housing part 7. And the width | variety of the left-right direction of the 2nd buffer 10 is formed in the same length as the space | interval of the left-right wall surfaces 7c and 7d in the 2nd accommodating part 7. FIG. That is, the second buffer body 10 is accommodated in the second housing part 7, and between the left and right wall surfaces 7 c and 7 d of the second housing part 7 and the left and right end parts 10 c and 10 d of the second buffer body 10. It is comprised so that a gap may not be provided. For this reason, the second shock absorber 10 is restricted so as not to relatively move in the left-right direction in the second housing portion 7 while being allowed to move in the front-rear direction in the second housing portion 7.

  Therefore, as described above, in the shoe S according to the first embodiment, when the ground contact surface 2 of the outsole 1 contacts the road surface and the weight of the human body is applied to the heel support surface 12, The front and rear gaps 21 and 22 provided between the front and rear wall surfaces 7a and 7b and the front and rear end portions 10a and 10b of the second buffer body 10 housed in the second housing portion 7 are made of an elastic material. The second buffer body 10 has a structure that allows relative movement in the front-rear direction within the second housing portion 7. For this reason, not only the vertical vertical impact generated on the heel support surface 12 is absorbed by the cushioning property of the second buffer body 10, but also the longitudinal impact generated on the heel support surface 12 is generated in the second housing portion 7. The movement of the two shock absorbers 10 in the front-rear direction causes escape in the midsole 3. That is, when the ground contact surface 2 of the outsole 1 contacts the road surface, the impact in the vertical vertical direction and the front / rear direction generated on the heel support surface 12 is reduced by the cushioning property and the mobility of the second buffer body 10. As a result, it is possible to improve the feeling of grounding, the walking comfort and the running comfort of the user wearing the shoes S when walking or running.

  Moreover, since each of the front side and rear side gaps 21 and 22 is in the range of 0.5 to 5.0 mm, the second shock absorber 10 does not move in the front-rear direction more than necessary, and the shoes S are worn. It is possible to sufficiently improve the grounding feeling, walking comfort and running comfort of the user when walking or running.

  Further, since the width in the left-right direction of the second buffer body 10 is formed to be approximately the same as the distance between the left and right wall surfaces 7c, 7d in the second storage portion 7, the second buffer body 10 is provided in the second storage space. The left and right wall surfaces 7c and 7d of the portion 7 and the left and right end portions 10c and 10d of the second buffer body 10 are accommodated in the second accommodating portion 7 without a gap, and are allowed to move in the front-rear direction within the second accommodating portion 7. Will be. That is, since the second buffer body 10 is restricted so as not to move in the left-right direction within the second housing portion 7, it is possible to intensively suppress the impact in the front-rear direction generated on the heel support surface 12. As a result, it is possible to further improve the feeling of grounding, the walking comfort and the running comfort of the user wearing the shoes S when walking or running.

  The second buffer 10 has a laminated structure in which a plurality of thin plates 11, 11 made of a plurality of elastic materials are stacked one above the other, and each of the thin plates 11, 11 is independently in the second housing portion 7. Since it is configured to be relatively movable in the front-rear direction, the amount of movement in the front-rear direction of the second buffer body 10 in the second accommodating portion 7 is relatively increased with the relative movement in the front-rear direction between the thin plates 11, 11. As a result, the impact mitigation property in the front-rear direction generated on the heel support surface 12 can be further enhanced.

  Moreover, since the 2nd buffer body 10 consists of the same material as the midsole main body 4, the cushioning property of the 2nd buffer body 10 becomes equivalent to the midsole main body 4, and it is in the sole support surface 5 and the heel support surface 12 The vertical shock generated in the vertical direction can be evenly absorbed by the entire midsole, and the walking comfort and running comfort can be improved without a sense of incongruity.

[Second Embodiment]
5 and 6 show a shoe S according to a second embodiment of the present invention. In this embodiment, as compared with the first embodiment, the second buffer body 10 is configured to be movable in the left-right direction within the second housing portion 7. The other configuration of the shoe S according to this embodiment is the same as the configuration of the shoe S according to the first embodiment. For this reason, in the following description, the same code | symbol is attached | subjected about the same part as FIGS. 1-4, and the detailed description is abbreviate | omitted.

  That is, as shown in FIGS. 5 and 6, the left end surface 10 c of the second buffer 10 has a left wall surface 7 c of the second housing portion 7 so as to follow the linear shape of the left wall surface 7 c in the second housing portion 7. Are formed in a straight line at a predetermined interval. On the other hand, the right end portion 10d of the second buffer body 10 is curved with a predetermined distance from the right wall surface 7d in the second housing portion 7 so as to follow the curved shape of the right wall surface 7d in the second housing portion 7. Is formed. And in the state where the 2nd buffer 10 is stored in the 2nd storage part 7, left-and-right wall surface 7c, 7d in the 2nd storage part 7, and right-and-left side edge 10c, 10d of the 2nd buffer 10 Between the left and right gaps 23 and 24, respectively, are provided. That is, the gaps 21 to 24 are provided between the second housing portion 7 and the second buffer body 10 in the entire periphery including the front, rear, left and right in the second housing portion 7. Here, each of the left and right gaps 23 and 24 is preferably set within a range of 0.5 to 5.0 mm, more preferably around 2.0 mm.

  When the ground contact surface 2 of the outsole 1 contacts the road surface and the weight of the human body is applied to the heel support surface 12, the second shock absorber 10 has the left and right gaps 23 and 24 in the second housing portion 7. Thus, relative movement in the left-right direction is possible. Further, each of the two thin plates 11, 11 constituting the second buffer body 10 is in an unfixed state, and is configured to be relatively movable in the left-right direction independently within the second housing portion 7. Yes.

  As described above, in the shoe S according to the second embodiment, when the ground contact surface 2 of the outsole 1 contacts the road surface and the weight of the human body is applied to the heel support surface 12, The left and right gaps 23 and 24 provided between the wall surfaces 7c and 7d and the left and right end portions 10c and 10d of the second buffer body 10 accommodated in the second accommodating portion 7 are made of a second material made of an elastic material. The buffer body 10 is configured to allow relative movement in the left-right direction within the second housing portion 7. For this reason, not only the vertical vertical impact generated on the heel support surface 12 is absorbed by the cushioning property of the second buffer body 10, but also the front-rear and left-right impacts generated on the heel support surface 12 are the second housing portion 7. The second shock absorber 10 is moved away in the midsole 3 by the movement in the front-rear direction and the left-right direction. That is, when the ground contact surface 2 of the outsole 1 contacts the road surface, the cushioning property of the second shock absorber 10 and the movement toward the four peripheral wall surfaces 7a to 7d within the second storage portion 7 are allowed. The impact of the shock absorber 10 in the vertical vertical direction and the front / rear / right / left direction is mitigated by the mobility of the shock absorber 10. As a result, it is possible to further improve the feeling of grounding, the walking comfort and the running comfort of the user wearing the shoes S when walking or running.

  In addition, since each of the left and right gaps 23 and 24 is in the range of 0.5 to 5.0 mm, the second shock absorber 10 does not relatively move in the left-right direction more than necessary, and the shoe S is worn. It is possible to sufficiently improve the grounding feeling, walking comfort and running comfort of the person walking or running.

  Further, the second buffer body 10 has a laminated structure in which thin plates 11 and 11 made of two elastic materials are vertically laminated, and each of the thin plates 11 and 11 is independently provided in the second housing portion 7. Since it is configured to be movable in the left-right direction, the amount of movement in the left-right direction of the second buffer body 10 in the second housing portion 7 relatively increases with the relative movement in the left-right direction between the thin plates 11, 11. As a result, the impact mitigation property in the left-right direction generated on the heel support surface 12 can be further enhanced.

[Modification of Second Embodiment]
In the midsole 3 of the shoe S according to this embodiment, the second storage portion 7 is a plane along the vertical direction so as to have a cross-sectional structure having the same shape on the opening side (upper side) and the back side (lower side). However, the present invention is not limited to this form.

  For example, as shown in FIG. 7, the left and right wall surfaces 7 c and 7 d in the second housing portion 7 may have a stepped structure formed in a stepped shape in the vertical direction. In this case, the lower portions of the left and right wall surfaces 7c and 7d are formed so that the width in the left-right direction is narrower than that of the upper portion, and the lower thin plate 11 constituting the second shock absorber 10 is more than the upper thin plate 11. May be formed so that the width in the left-right direction is reduced. And in this modification, each of the thin plates 11 and 11 arrange | positioned up and down is comprised in the 2nd accommodating part 7 independently so that a movement in the left-right direction is possible.

  Moreover, as shown in FIG. 8, the 2nd accommodating part 7 is good also as a cross-sectional V-shape formed so that the bottom face 7e (right-and-left wall surface 7c, 7d) might narrow the left-right space | interval toward the downward direction. In this case, the second buffer body 10 only needs to be formed such that the lower thin plate 11 is bent in a V-shaped cross section and the upper thin plate 11 has a substantially inverted triangular cross section. And also in this modification, each of the thin plates 11 and 11 arrange | positioned up and down is comprised independently within the 2nd accommodating part 7, and can be relatively moved to the left-right direction.

  That is, in the modification examples as shown in FIGS. 7 and 8, since the second accommodating portion 7 is formed so that the left and right intervals are narrowed downward, the vertical vertical direction generated on the heel support surface 12 is reduced. The impact is easily concentrated on the central portion of the second buffer body 10, and the impact absorption in the vertical vertical direction by the second buffer body 10 can be further enhanced. In any of the modifications, each of the thin plates 11, 11 arranged vertically is configured to be movable in the left-right direction independently within the second housing portion 7, and as described above, the second plate By relatively increasing the amount of movement of the second buffer body 10 in the left-right direction within the housing portion 7, it is possible to enhance the impact mitigation property in the left-right direction generated on the heel support surface 12.

  Further, in the modification shown in FIG. 8, the second buffer body 10 having a substantially inverted triangular cross section is fitted in the second accommodating portion 7 having a V-shaped cross section. Compared to the configuration according to the modified example, the relative movement in the left-right direction is suppressed, while the relative movement in the front-rear direction is facilitated. Even if the thin plates 11, 11 are relatively moved in the left-right direction due to the left-right impact generated on the heel support surface 12, the center position of the lower thin plate 11 (the top of the inverted triangle) is the left-right direction of the second housing portion 7. It is easy to return to the center position (the valley of the bottom surface 7e shown in FIG. 8), and the center position of the upper thin plate 11 (the top of the inverted triangle) also easily returns to the valley on the upper surface of the lower thin plate 11. As described above, in the modification shown in FIG. 8, the second buffer body 10 is allowed to move relatively in the left-right direction in the second housing portion 7, and the fixed position (initial stage) in the second housing portion 7 is set. The second buffer body 10 can be easily held stably at the position).

[Other Embodiments]
In the shoe S according to each of the above embodiments, as shown in FIGS. 9 and 10, the upper and lower sides are seen in a side view between the outsole 1 and the midsole 3 in the range from the arch portion of the human foot to the rear side of the buttocks. Alternatively, the corrugated plate 30 that is curved so as to undulate may be arranged separately. By providing the corrugated plate 30, the midsole 3 is not greatly deformed locally even when a vertical vertical impact occurs on the heel support surface 12 and the sole support surface 5, and the human body during walking or running It is possible to suppress a state in which the ankle of the body falls excessively toward the inner side or the outer side, and to maintain better stability.

  In the midsole 3 of the shoe S according to each of the above embodiments, the first buffer body 8 is accommodated in a state where it is not fixed to the peripheral wall surfaces 6a to 6d and the bottom surface 6e of the first storage portion 6 (that is, in a non-fixed state). However, the present invention is not limited to this form. That is, the first buffer body 8 may be stored in a state of being fixed to the first storage portion 6.

  In the midsole 3 of the shoe S according to each of the above embodiments, the thin plates 11 and 11 constituting the second buffer body 10 are made of the same material as that of the midsole body 4. However, the present invention is not limited to this form. That is, the material of the thin plates 11 and 11 constituting the second buffer body 10 may be an elastic material having a specific gravity smaller than that of the midsole body 4 or an elastic material having a lower hardness. With such a configuration, the impact in the vertical vertical direction generated particularly on the heel support surface 12 among the sole support surface 5 is more concentrated due to the cushioning property of the second buffer body 10 which is higher than the midsole body 4. Can be absorbed into.

  In the midsole 3 of the shoe S according to each of the embodiments described above, the second buffer body 10 is formed of the two elastic thin plates 11 and 11 stacked one above the other. However, the present invention is not limited to this. That is, the second buffer body 10 may be formed of three or more elastic thin plates 11, 11,.

  As mentioned above, although embodiment about this invention was described, this invention is not limited only to the above-mentioned embodiment, A various change is possible within the scope of the invention.

  Next, specific examples will be described.

[Acceleration characteristic evaluation test 1]
In this evaluation test, the force acting on the subject's feet during running was considered from the viewpoint of kinematics. Specifically, an accelerometer was attached to the tibia part above the ankle joint of the subject (position about 4 cm directly above the inner heel), and the temporal change in the longitudinal acceleration acting on the subject's foot during running was measured.

  FIG. 11 is a graph showing the measurement results, and the change in the landing state of the subject's foot corresponds to the up and down fluctuations of the waveform. The horizontal axis in the figure represents time (msec). The vertical axis represents the longitudinal acceleration waveform (Unit), which indicates the acceleration in the backward direction relative to the traveling direction from the origin to the upper side, and the acceleration in the forward direction from the origin to the lower side in the traveling direction. . In addition, each value (that is, acceleration value corresponding to a certain time) constituting the waveform shown in FIG. 11 is based on an actual measurement value measured using the above-described accelerometer.

  FIG. 11 shows waveforms for two types of shoes according to Example 1 and Comparative Example 1, respectively. Comparative Example 1 is a result of using a conventional shoe that is not provided with a gap, which is a feature of the present invention. In addition, Example 1 is a result of using the shoe according to the present invention in which the front and rear gaps and the left and right gaps (each gap has a dimension of 2.0 mm), which are features of the present invention, are provided. .

  As shown in FIG. 11, it can be seen that acceleration in the backward and forward directions is alternately and repeatedly acting on the running foot in a series of cycles from ground contact to transition to ground. And it turned out that the up-and-down fluctuation width of the waveform of Example 1 is smaller than the waveform of Comparative Example 1 at 10 to 30 msec. In particular, at the time of about 17 msec (that is, when the first large valley appears), the acceleration value at the time corresponding to the valley of the waveform of Comparative Example 1 was about minus 4000. In the waveform of Example 1, the value was suppressed to about minus 2000. That is, regarding the acceleration in the forward direction, the waveform of Example 1 was suppressed to about half the value of the waveform of Comparative Example 1. On the other hand, at the time of about 19 msec (that is, when the first large peak appears), the acceleration value corresponding to the peak of the waveform of Comparative Example 1 was about 7000, whereas the example The waveform of 1 was suppressed to a value of about 5000. That is, regarding the acceleration in the backward direction, the waveform of Comparative Example 1 was suppressed to be smaller than the waveform of Example 1. From these results, it was confirmed that the shoes according to the present invention suppressed the impact in the front-rear direction when the subject touched down compared to the conventional shoes.

[Acceleration characteristic evaluation test 2]
In this evaluation test, the subjects were worn with the shoes of Examples 2 to 7 and Comparative Examples 2 and 3 shown in Table 1 below, and the acceleration in the front-rear direction when each shoe was worn was measured.

  Here, the measurement method of the acceleration in the front-rear direction is the same as in the evaluation test 1 described above, in which an accelerometer is attached to the tibia part above the subject's ankle joint (position about 4 cm directly above the inner heel) and acts on the subject's foot while running. The acceleration value in the longitudinal direction was measured. The results of this evaluation test are shown in FIG. The result of the bar graph shown in FIG. 12 is derived by integrating the absolute value of the acceleration measured by the accelerometer described above in the range of 0 to 100 ms.

  As shown in FIG. 12, the gaps characteristic of the present invention, i.e., in Examples 2-6 and 7 with front and rear gaps set in the range of at least 0.5-5.0, respectively, It was found that the acceleration values in the front-rear direction were generally kept lower than those of Comparative Examples 2 and 3 in which no gap was provided, which is a feature of the invention. Moreover, among Examples 2-6, in Example 2 and 4-6 provided with the 2nd buffer body by which the thin plate was laminated | stacked by two layers, it is the front-back direction rather than Example 3 provided with the buffer body of only one layer. It was found that the acceleration value was kept low.

  Further, in the sixth embodiment in which only the front and rear gaps are provided, the longitudinal acceleration value is further suppressed to be lower than those in the second to fifth embodiments in which the front and rear gaps and the left and right gaps are provided. I found out. This is because in Example 6, the second buffer body is allowed to move in the front-rear direction within the second housing portion, and the second buffer body is restricted so as not to easily move in the left-right direction within the second housing portion. The longitudinal impact generated on the heel support surface is intensively suppressed, and as a result, the longitudinal acceleration value is kept low. And if each dimension of the front side and the rear side gap is set to 2.0 mm in the range of 0.5 to 5.0 mm, the acceleration value in the front-rear direction can be further suppressed. I understood.

  Furthermore, in Example 7 in which the corrugated plate was provided, it was found that the acceleration value in the front-rear direction was suppressed to be lower than that in Examples 2-6.

  From these results, it was confirmed that the impact according to the front-rear direction when the subject touches down is suppressed in the shoes according to the present invention as compared with the conventional shoes. That is, it has been found that the shoes according to the present invention can improve the grounding feeling, walking comfort and running comfort of the user when walking or running.

  The present invention can be industrially used as a shoe for running or walking.

S: Shoes 1: Outsole 2: Grounding surface 3: Midsole 4: Midsole body 5: Foot support surface 7: Second accommodating part (accommodating part)
7a: front wall surface 7b: rear wall surface 7c: left wall surface 7d: right wall surface 7e: bottom 10: second buffer (buffer)
10a: front end portion 10b: rear end portion 10c: left end portion 10d: right end portion 11, 11: thin plate 12: saddle support surface 21: front gap 22: rear gap 23: left gap 24: right gap 30: corrugated plate

Claims (8)

A shoe comprising a midsole that is disposed on the upper side of an outsole having a ground contact surface that contacts the road surface and supports a sole of a human body,
The midsole is
A midsole body made of an elastic material extending in the front-rear direction having a sole support surface on the upper surface for supporting the sole of the foot from the fingertip side of the human body to the back of the buttocks;
An accommodation portion provided in a rear region of the sole support surface of the midsole body, the sole support surface being formed in a concave shape toward the outsole;
A shock absorber made of an elastic material that is accommodated in the accommodation portion in a non-fixed state, includes a heel support surface that supports the heel portion of the foot on the upper surface, and absorbs a vertical vertical impact applied to the heel support surface. And
Between the front and rear wall surfaces in the housing part and the front and rear end parts of the buffer body housed in the housing part, front and rear gaps are respectively provided .
When the grounding surface of the outsole is in contact with the road surface and the weight of a human body is applied to the heel support surface, the cushioning body can be relatively moved in the front-rear direction by the front and rear gaps in the housing portion. going on, shoes. The shoe according to claim 1,
The shoe, wherein the front and rear gaps are in the range of 0.5 to 5.0 mm. The shoe according to claim 1 or 2,
The width | variety of the left-right direction of the said buffer is shoes which are formed in the length substantially the same as the space | interval between the left-right wall surfaces in the said accommodating part. The shoe according to claim 1 or 2,
Between the left and right wall surfaces in the housing portion and the left and right side end portions of the buffer body housed in the housing portion, left and right gaps are respectively provided.
When the grounding surface of the outsole contacts the road surface and the weight of a human body is applied to the heel support surface, the buffer body can be relatively moved in the left-right direction by the left and right gaps in the housing portion. ,shoes. The shoe according to claim 4,
The left and right gaps are in the range of 0.5 to 5.0 mm. In the shoe according to any one of claims 1 to 5,
The shock absorber has a laminated structure in which thin plates made of a plurality of elastic materials are laminated vertically.
Each of the thin plates is a shoe configured to be relatively movable independently within the housing portion. In the shoe according to any one of claims 1 to 6,
The shock absorber is a shoe made of the same material as the midsole body. In the shoe according to any one of claims 1 to 6,
The shock absorber is a shoe made of an elastic material having a specific gravity smaller than that of the midsole body or an elastic material having a lower hardness.

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