EP2848142B1 - Shoe soles having inclined grooves - Google Patents
Shoe soles having inclined grooves Download PDFInfo
- Publication number
- EP2848142B1 EP2848142B1 EP12876174.9A EP12876174A EP2848142B1 EP 2848142 B1 EP2848142 B1 EP 2848142B1 EP 12876174 A EP12876174 A EP 12876174A EP 2848142 B1 EP2848142 B1 EP 2848142B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- section
- diagonal
- diagonal groove
- shoe sole
- rear foot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- 210000002683 foot Anatomy 0.000 claims description 71
- 230000002787 reinforcement Effects 0.000 claims description 21
- 239000011347 resin Substances 0.000 claims description 6
- 229920005989 resin Polymers 0.000 claims description 6
- 210000000454 fifth toe Anatomy 0.000 claims description 5
- 210000001255 hallux Anatomy 0.000 claims description 5
- 210000000549 articulatio subtalaris Anatomy 0.000 description 6
- 210000000474 heel Anatomy 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000000386 athletic effect Effects 0.000 description 1
- 210000000459 calcaneus Anatomy 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 210000000610 foot bone Anatomy 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 210000004233 talus Anatomy 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/22—Soles made slip-preventing or wear-resisting, e.g. by impregnation or spreading a wear-resisting layer
- A43B13/223—Profiled soles
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
-
- A—HUMAN NECESSITIES
- A43—FOOTWEAR
- A43B—CHARACTERISTIC FEATURES OF FOOTWEAR; PARTS OF FOOTWEAR
- A43B13/00—Soles; Sole-and-heel integral units
- A43B13/14—Soles; Sole-and-heel integral units characterised by the constructive form
- A43B13/141—Soles; Sole-and-heel integral units characterised by the constructive form with a part of the sole being flexible, e.g. permitting articulation or torsion
Definitions
- the present invention relates to a shoe sole having a diagonal groove.
- Shoe soles having a diagonal groove are known in the art, for example in JP 2008-620 A ( FIG. 4 , FIG. 10(b)) or in JP H07-236503 A .
- a shoe sole comprising (see, e.g. figs. 2 , 6 ): an outsole (1) having a tread surface to be in contact with a road surface; and a midsole (3) arranged on the outsole, wherein: in a central section and a lateral side section of a rear foot section of the shoe sole, a diagonal groove (8) is formed extending in a diagonal front-rear direction in the rear foot section to an outer edge of a lateral side of the rear foot section; an angle, formed by a virtual center line of the diagonal groove and a longitudinal axis connecting between a center of a heel and a middle point between a big-toe ball and a little-toe ball, is set in a range of 12° to 35° (as it can be clearly derived from fig.
- a virtual intersection point between the longitudinal axis and the center line is set within a range of 21% to 43% of a full length of the longitudinal axis of the shoe sole from a posterior end of the shoe sole, the diagonal groove extending to a point anterior and medial to the intersection point (see the measurements at fig. 6 ).
- a shoe sole is required to be light in weight, be capable of suppressing eversion of the heel area, and serve to absorb the impact on the heel area.
- the present invention in one aspect is a shoe sole according to the appended claims.
- the diagonal groove 4 includes a front section 4F located anterior to the intersection point O, and a rear section 4B located posterior to the intersection point O; and a volume of the diagonal groove 4 in the rear section 4B is larger than a volume of the diagonal groove 4 in the front section 4F.
- the diagonal groove 4 does not extend to a medial edge of the shoe sole.
- the upper surface of the midsole 2 less easily sinks in the arch section M or the middle foot section.
- the diagonal groove 4 of the outsole 1 flares toward a diagonally posterior direction (widens in its width as it extends in a diagonally posterior direction).
- the shoe sole further includes a transversal groove 5 extending in a direction perpendicular to the diagonal groove 4.
- Such a transversal groove 5 will divide the outsole 1 into pieces on the lateral side of the foot, and will facilitate the deformation of the outsole 1 and the midsole 2 on the lateral side of the foot.
- the outsole 1 is divided into pieces arranged in a front foot section F and in the rear foot section R, thereby leaving uncovered an arch section M between the front foot section F and the rear foot section R; a reinforcement member 3 formed by a non-foamed body of a resin is attached on a lower surface of the midsole 2 in the arch section M ; and the reinforcement member 3 has a diagonal section 31 extending generally parallel to the diagonal groove 4, and the diagonal section 31 is arranged in a vicinity of the diagonal groove 4 and anterior to the diagonal groove 4.
- a position of the virtual intersection point O is arranged anterior to a centroid G of the central section Rc.
- the diagonal groove 4 is arranged over, or in the vicinity of, the subtalar joint axis A1.
- the diagonal groove 4 formed in the midsole 2 in the central section Rc of the rear foot section R is defined by one pair of first and second edge lines L1 and L2 which face each other; the diagonal groove 4 formed in the outsole 1 is defined by one pair of third and fourth edge lines L3 and L4 which face each other; and the third and fourth edge lines L3 and L4 are generally parallel to the first and second edge lines L1 and L2, respectively, or flare (gradually widen therebetween) to form an angle therebetween larger than an angle formed by the first and second edge lines L1 and L2.
- the diagonal groove 4 of the midsole 2 and that of the outsole 1 cooperate with each other, thereby enhancing the advantageous effect of the present invention.
- the diagonal groove 4 extends to a medial side section 20 of the midsole 2 in the arch section M ; and an average value of a cross-sectional area perpendicular to the center line Lc of the diagonal groove 4 in the arch section M is smaller than an average value of a cross-sectional area perpendicular to the center line Lc of the diagonal groove 4 in the central section Rc of the rear foot section R in the midsole 2.
- the diagonal groove 4 does not extend to an edge of the medial side section 20 of the midsole 2 in the arch section M; and a tip of the diagonal groove 4 is arranged posterior to an anterior end of the arch section M.
- the cross-sectional area of the diagonal groove 4 is small on the medial side of the arch section M, or the diagonal groove 4 does not extend to the medial edge of the arch section M, so that the sinking of the upper surface of the midsole is small on the medial side of the arch section M. Therefore, it is possible to suppress pronation of the foot, and to prevent the center of gravity from remaining stagnant on the medial side of the arch section M.
- the diagonal groove 4 of the outsole 1 flares toward a posterior direction (widens in its width as it extends in a posterior direction).
- the shoe sole further includes a transversal groove perpendicular to the diagonal groove 4.
- a reinforcement member 3 formed by a non-foamed body of a resin is attached to a lower surface of the midsole 2 in the arch section M; and the reinforcement member 3 has a diagonal section 31 extending generally parallel to the diagonal groove 4, and the diagonal section 31 is arranged in a vicinity of the diagonal groove 4 and anterior to the diagonal groove 4.
- the diagonal section 31 extends to the front foot section F.
- the reinforcement member 3 further includes a lateral side section 32 extending along a lateral edge of the midsole 2 in the arch section M; and the lower surface of the midsole 2 is exposed between the lateral side section 32 and the diagonal section 31.
- the present invention in one aspect is a shoe sole including: an outsole 1 having a tread surface to be in contact with a road surface; and a midsole 2 arranged on the outsole 1, the shoe sole supporting a foot in a front foot section F, an arch section M, and a rear foot section R, wherein:
- the diagonal section 31 extends to the front foot section F.
- the reinforcement member 3 further includes a lateral side section 32 extending along a lateral side of the midsole 2 in the arch section M; and the lower surface of the midsole 2 is exposed between the lateral side section 32 and the diagonal section 31.
- the shoe sole includes the outsole 1 and the midsole 2. Note that FIGS. 1 to 5 do not show small grooves (so called "design") formed in the tread surface of the outsole 1.
- the outsole 1 is arranged over the front foot section F and the rear foot section R.
- the outsole 1 is formed by a foamed body or a non-foamed body of a rubber, for example, and has a tread surface 1s ( FIG. 7A ) to be in contact with the road surface. Note that in FIG. 3 , the outsole 1 is shaded with regular large dots.
- the midsole 2 is formed by a foamed body of a resin such as EVA, for example, and is arranged on the outsole 1, as shown in FIG. 2 , for absorbing the impact upon landing. Therefore, the midsole 2 is formed to be thicker than the outsole 1.
- a lower surface 2u ( FIG. 7A ) of the midsole 2 is provided with the diagonal groove 4 and the transversal groove 5 to be described later, and with the outsole 1 divided into a plurality of parts.
- the midsole 2 may be exposed in the central section Rc of the rear foot section R and/or the arch section M.
- the outsole 1 is divided into pieces arranged in the front foot section F and in the rear foot section R, thereby leaving uncovered the arch section M, and is formed in the rear foot section R in a U shape in which the central section Rc is cut out. That is, in the central section Rc of the rear foot section R, the outsole 1 is not provided on the surface of the midsole 2.
- a U shape in which the central section Rc of the outsole 1 is cut out includes arrangements where the outsole 1 is divided into a plurality of parts in the rear foot section R by a plurality of diagonal and transversal grooves 4 and 5, and further means that the outsole 1 is absent in the central section Rc and that the outsole 1 at the anterior end of the rear foot section R is divided into medial and lateral pieces by the diagonal groove 4.
- the midsole 2 may be slightly dented.
- the diagonal groove 4 extends in a diagonal front-rear direction from the medial edge on the medial side IN of the arch section M to the lateral edge on the lateral side OUT of the rear foot section R.
- the depth of the deepest portion of the diagonal groove 4 in the central section Rc is preferably about 5 mm to about 10 mm, for example, and the depth of the deepest portion of the diagonal groove 4 in the lateral side section 11 is preferably about 5 mm to about 15 mm, for example. This is because the advantageous effects such as the light weight cannot be obtained sufficiently if the depth is too small, whereas the stable foot support cannot be obtained if the depth is too large.
- the width of the diagonal groove 4 in the central section Rc is preferably about 5 mm to about 15 mm, for example, except for the area of the transversal groove 5.
- the torsional rigidity lowers significantly if the width of the groove is too large, whereas the advantageous effects such as the light weight cannot be obtained if the width of the groove is small.
- the diagonal groove 4 does not need to extend to the medial edge on the medial side IN in the arch section M.
- the anterior end of the diagonal groove 4 may be arranged posterior to the arch section M or the anterior end of the rear foot section R.
- the angle ⁇ formed between the subtalar joint axis A1 and the longitudinal axis A2 is said to be 23° ⁇ 11°.
- the longitudinal axis A2 is represented by a straight line connecting between the center 04 of the heel and the middle point 03 between the center of the big-toe ball O1 and the center of the little-toe ball 05.
- the subtalar joint axis A1 is represented by a straight line connecting between the head 06 of the talus and the calcaneus lateral tubercle 07.
- the diagonal groove 4 is formed along the subtalar joint axis A1 . That is, in FIG. 5 , the angle ⁇ formed by the longitudinal axis A2 and the virtual center line Lc of the diagonal groove 4 is set in the range of 12° to 35°, and is set to about 30° in the present embodiment, for example.
- the virtual intersection point O between the center line Lc and the longitudinal axis A2 is set in a region from the rear half section of the arch section M to the front half section Rf of the rear foot section R. Represented by a dimensional proportion, the virtual intersection point O of FIG. 5 is set in a range of 21% to 43% of the full length of the longitudinal axis A2 of the shoe sole from the posterior end.
- the diagonal groove 4 extends anterior and medial to the intersection point O and extends posterior and lateral to the intersection point O .
- the position of the virtual intersection point O is provided in the central section Rc of the rear foot section R, and is arranged anterior to the centroid G of the central section Rc.
- the diagonal groove 4 is arranged over the subtalar joint axis A1 ( FIG. 6 ).
- the centroid G refers to the center of the planar shape of the central section Rc.
- the diagonal groove 4 includes the front section 4F anterior to the intersection point O , and the rear section 4B posterior to the intersection point O .
- the volume Vb of the diagonal groove 4 in the rear section 4B is greater than the volume Vf of the diagonal groove 4 in the front section 4F.
- the volume Vb, Vf of the diagonal groove 4 is the cross-sectional area of the diagonal groove 4 multiplied by the length of the diagonal groove 4 across the corresponding section. Therefore, the diagonal groove 4 in the arch section M is shallow, for example, and the average value of the cross-sectional area perpendicular to the center line Lc is as shown in FIGS. 8A to 8C , where the average value of the cross-sectional area of the diagonal groove 4 in the arch section M is smaller than the average value of the cross-sectional area of the diagonal groove 4 in the central section Rc of the rear foot section R of the midsole 2.
- the depth of the diagonal groove 4 in the arch section M of FIG. 2 gradually decreases as the groove 4 extends in the diagonally anterior direction.
- the cross-sectional area of the diagonal groove 4 may be largest in the central section Rc of the rear foot section R of FIG. 7A , and the cross-sectional area of the diagonal groove 4 may be slightly smaller in a rear portion of the rear foot section R of FIG. 7B .
- the diagonal groove 4 formed in the central section Rc of the rear foot section R of the midsole 2 is defined by one pair of first and second edge lines L1 and L2 which are parallel to and facing each other.
- the diagonal groove 4 formed in the outsole 1 is defined by one pair of third and fourth edge lines L3 and L4 which are parallel to and facing each other.
- the third and fourth edge lines L3 and L4 are generally parallel to the first and second edge lines L1 and L2, respectively, in the present embodiment, the third and fourth edge lines L3 and L4 may be formed to flare (gradually widen in width therebetween) with an angle greater than the angle formed by the first and second edge lines L1 and L2 as shown in FIG. 9 . That is, the diagonal groove 4 in the lateral side section 11 of the outsole 1 may be formed to flare toward the diagonally posterior direction.
- the transversal groove 5 of FIG. 5 extends in a direction perpendicular to the diagonal groove 4, and the transversal groove 5 is arranged so as to be perpendicular to the diagonal groove 4 in the present embodiment, the angle formed between the transversal groove 5 and the diagonal groove 4 may be set to about 70° to about 90°.
- the transversal groove 5 divides the outsole 1 into pieces in the medial side section 10 and in the lateral side section 11 of the U-shaped outsole 1. Note that as shown in FIG. 9 , the transversal groove 5 may be formed to flare (gradually widen) in the direction from the medial side IN toward the lateral side OUT.
- the reinforcement member 3 formed by a non-foamed body of a resin is attached on the lower surface of the midsole 2 in the arch section M.
- the reinforcement member 3 has the diagonal section 31 extending generally parallel to the diagonal groove 4, and the diagonal section 31 is arranged in the vicinity of the diagonal groove 4 and anterior to the diagonal groove 4.
- the diagonal section 31 may be extending from the arch section M to at least the posterior end of the front foot section F.
- the reinforcement member 3 further includes the lateral side section 32 extending along the lateral side of the midsole 2 in the arch section M.
- a connecting section 33 is provided to bridge between the diagonal section 31 and the lateral side section 32 so as to connect between these sections 31 and 32. That is, the exposed section 22 of the midsole 2 is exposed in the area surrounded by the diagonal section 31, the lateral side section 32 and the connecting section 33.
- the diagonal section 31 only needs to be arranged along the diagonal groove 4 above the diagonal groove 4, and therefore even a reinforcement member 3 that covers generally the entire area of the arch section M, as shown in FIG. 9 , has a diagonal section 31.
- the outsole 1 may be provided generally over the entire length from the front foot section F to the rear foot section R and across the entire area thereof. Moreover, in the arch section M or the rear foot section R, the midsole 2 may not be exposed.
- the reinforcement member 3 and the transversal groove 5 may be absent.
- the present invention is applicable to various athletic shoes such as for running.
Landscapes
- Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
Description
- The present invention relates to a shoe sole having a diagonal groove.
- Shoe soles having a diagonal groove are known in the art, for example in
JP 2008-620 A FIG. 4 , FIG. 10(b)) or inJP H07-236503 A - On the other hand,
document DE 201 07 343 U1 discloses (the references in brackets applying to this document): A shoe sole comprising (see, e.g.figs. 2 ,6 ): an outsole (1) having a tread surface to be in contact with a road surface; and a midsole (3) arranged on the outsole, wherein: in a central section and a lateral side section of a rear foot section of the shoe sole, a diagonal groove (8) is formed extending in a diagonal front-rear direction in the rear foot section to an outer edge of a lateral side of the rear foot section; an angle, formed by a virtual center line of the diagonal groove and a longitudinal axis connecting between a center of a heel and a middle point between a big-toe ball and a little-toe ball, is set in a range of 12° to 35° (as it can be clearly derived fromfig. 6 ); and a virtual intersection point between the longitudinal axis and the center line is set within a range of 21% to 43% of a full length of the longitudinal axis of the shoe sole from a posterior end of the shoe sole, the diagonal groove extending to a point anterior and medial to the intersection point (see the measurements atfig. 6 ). - As is well known in the art, a shoe sole is required to be light in weight, be capable of suppressing eversion of the heel area, and serve to absorb the impact on the heel area.
- However, these functions cannot be realized sufficiently only by forming a diagonal groove in a shoe sole.
- It is therefore an object of the present invention to form an appropriate diagonal groove so as to realize these functions.
- The present invention in one aspect is a shoe sole according to the appended claims.
- The following description of the drawings has the purpose to help to understand the invention. However, the scope of protection of the invention is defined solely by the appended claims. Accordingly, any "embodiment" or any other kind of the example no covered by the subject-matter of the claims is not part of the invention, but simply an example useful for understanding it.
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FIG. 1 is a perspective view showing a shoe according to one embodiment of the present invention as seen from the bottom rear side. -
FIG. 2 is a perspective view showing the shoe as seen from the bottom lateral side. -
FIG. 3 is a bottom view showing a shoe sole. -
FIG. 4 is a bottom view showing the shoe sole. -
FIG. 5 is an enlarged bottom view showing an arch section and a rear foot section of the shoe sole. -
FIG. 6 is a plan view showing the foot bone structure. -
FIG. 7A is a cross-sectional view taken along line VIIA-VIIA ofFIG. 3 , andFIG. 7B is a cross-sectional view taken along line VIIB-VIIB ofFIG. 3 . -
FIGS. 8A to 8C show another embodiment, whereinFIG. 8A is a cross-sectional view showing a shoe sole in the arch section,FIG. 8B is a cross-sectional view of the shoe sole in the front half section of the rear foot section, andFIG. 8C is a cross-sectional view of the shoe sole at the posterior end of the rear foot section. -
FIG. 9 is a bottom view of a shoe sole illustrating still another embodiment. - Preferably, the
diagonal groove 4 includes afront section 4F located anterior to the intersection point O, and arear section 4B located posterior to the intersection point O; and
a volume of thediagonal groove 4 in therear section 4B is larger than a volume of thediagonal groove 4 in thefront section 4F. - Then, in the
rear section 4B where the volume of thediagonal groove 4 is large, deformation is relatively substantial, and the upper surface of themidsole 2 easily sinks, thereby making it possible to easily absorb the impact of the first strike upon landing. On the other hand, in thefront section 4F where the volume of thediagonal groove 4 is small, the upper surface of themidsole 2 less easily sinks, and the center of gravity is unlikely to remain stagnant on the medial side of the arch of the foot. - Preferably, the
diagonal groove 4 does not extend to a medial edge of the shoe sole. - Then, the upper surface of the
midsole 2 less easily sinks in the arch section M or the middle foot section. - Preferably, the
diagonal groove 4 of theoutsole 1 flares toward a diagonally posterior direction (widens in its width as it extends in a diagonally posterior direction). - Then, it is possible to easily absorb the impact of the first strike as described above, and the center of gravity is unlikely to remain stagnant on the medial side of the arch of the foot.
- Preferably, the shoe sole further includes a
transversal groove 5 extending in a direction perpendicular to thediagonal groove 4. - Such a
transversal groove 5 will divide theoutsole 1 into pieces on the lateral side of the foot, and will facilitate the deformation of theoutsole 1 and themidsole 2 on the lateral side of the foot. - Preferably, the
outsole 1 is divided into pieces arranged in a front foot section F and in the rear foot section R, thereby leaving uncovered an arch section M between the front foot section F and the rear foot section R;
areinforcement member 3 formed by a non-foamed body of a resin is attached on a lower surface of themidsole 2 in the arch section M; and
thereinforcement member 3 has adiagonal section 31 extending generally parallel to thediagonal groove 4, and thediagonal section 31 is arranged in a vicinity of thediagonal groove 4 and anterior to thediagonal groove 4. - In this case, the lowering of the arch section M due to the
diagonal groove 4 in the arch section M or in the vicinity of the arch section M will be prevented by thediagonal section 31 of thereinforcement member 3. - Preferably, a position of the virtual intersection point O is arranged anterior to a centroid G of the central section Rc.
- With such an arrangement, the
diagonal groove 4 is arranged over, or in the vicinity of, the subtalar joint axis A1. - Preferably, the
diagonal groove 4 formed in themidsole 2 in the central section Rc of the rear foot section R is defined by one pair of first and second edge lines L1 and L2 which face each other;
thediagonal groove 4 formed in theoutsole 1 is defined by one pair of third and fourth edge lines L3 and L4 which face each other; and
the third and fourth edge lines L3 and L4 are generally parallel to the first and second edge lines L1 and L2, respectively, or flare (gradually widen therebetween) to form an angle therebetween larger than an angle formed by the first and second edge lines L1 and L2. - In this case, the
diagonal groove 4 of themidsole 2 and that of theoutsole 1 cooperate with each other, thereby enhancing the advantageous effect of the present invention. - Preferably, the
diagonal groove 4 extends to amedial side section 20 of themidsole 2 in the arch section M; and an average value of a cross-sectional area perpendicular to the center line Lc of thediagonal groove 4 in the arch section M is smaller than an average value of a cross-sectional area perpendicular to the center line Lc of thediagonal groove 4 in the central section Rc of the rear foot section R in themidsole 2. - Preferably, the
diagonal groove 4 does not extend to an edge of themedial side section 20 of themidsole 2 in the arch section M; and a tip of thediagonal groove 4 is arranged posterior to an anterior end of the arch section M. - In these cases, the cross-sectional area of the
diagonal groove 4 is small on the medial side of the arch section M, or thediagonal groove 4 does not extend to the medial edge of the arch section M, so that the sinking of the upper surface of the midsole is small on the medial side of the arch section M. Therefore, it is possible to suppress pronation of the foot, and to prevent the center of gravity from remaining stagnant on the medial side of the arch section M. - Preferably, the
diagonal groove 4 of theoutsole 1 flares toward a posterior direction (widens in its width as it extends in a posterior direction). - Preferably, the shoe sole further includes a transversal groove perpendicular to the
diagonal groove 4. - Preferably, a
reinforcement member 3 formed by a non-foamed body of a resin is attached to a lower surface of themidsole 2 in the arch section M; and
thereinforcement member 3 has adiagonal section 31 extending generally parallel to thediagonal groove 4, and thediagonal section 31 is arranged in a vicinity of thediagonal groove 4 and anterior to thediagonal groove 4. - In this case, the lowering of the arch section M due to the
diagonal groove 4 in the arch section M or in the vicinity of the arch section M will be prevented by thediagonal section 31 of thereinforcement member 3. - Preferably, the
diagonal section 31 extends to the front foot section F. - In this case, excessive bending of the sole is prevented, thereby enabling efficient running.
- Preferably, the
reinforcement member 3 further includes alateral side section 32 extending along a lateral edge of themidsole 2 in the arch section M; and
the lower surface of themidsole 2 is exposed between thelateral side section 32 and thediagonal section 31. - In this case, it is possible to reduce the weight of the
reinforcement member 3. - The present invention in one aspect is a shoe sole including: an
outsole 1 having a tread surface to be in contact with a road surface; and amidsole 2 arranged on theoutsole 1, the shoe sole supporting a foot in a front foot section F, an arch section M, and a rear foot section R, wherein: - the
outsole 1 is divided into pieces arranged in the front foot section F and in the rear foot section R, thereby leaving uncovered the arch section M; - a
diagonal groove 4 is formed in themidsole 2 and theoutsole 1, thediagonal groove 4 extending in a diagonal front-rear direction in the rear foot section R to an outer edge of a lateral side of the rear foot section R; - an angle β, formed by a virtual center line Lc of the
diagonal groove 4 and a longitudinal axis A2 connecting between a center of a heel and a middle point 03 between a big-toe ball O1 and a little-toe ball 05, is set in a range of 12° to 35°; - a virtual intersection point O between the longitudinal axis A2 and the center line Lc is arranged within a region from a rear half section Mb of the arch section M to a front half section Rf of the rear foot section R;
areinforcement member 3 formed by a non-foamed body of a resin is attached on a lower surface of themidsole 2 in the arch section M; and
thereinforcement member 3 has adiagonal section 31 extending generally parallel to thediagonal groove 4, and thediagonal section 31 is arranged in a vicinity of thediagonal groove 4 and anterior to thediagonal groove 4. - In this aspect, the lowering of the arch section M due to the
diagonal groove 4 in the arch section M or in the vicinity of the arch section M will be prevented by thediagonal section 31 of thereinforcement member 3. - Preferably, the
diagonal section 31 extends to the front foot section F. - In this case, excessive bending of the sole is prevented, thereby enabling efficient running.
- Preferably, the
reinforcement member 3 further includes alateral side section 32 extending along a lateral side of themidsole 2 in the arch section M; and
the lower surface of themidsole 2 is exposed between thelateral side section 32 and thediagonal section 31. - In this case, it is possible to reduce the weight of the
reinforcement member 3. - The present invention will be understood more clearly from the following description of preferred embodiments taken in conjunction with the accompanying drawings. Note however that the embodiments and the drawings are merely illustrative, and should not be relied upon in defining the scope of the present invention. The scope of the present invention shall be defined only by the appended claims. In the accompanying drawings, like reference numerals denote like components throughout the plurality of figures.
- One embodiment of the present invention will now be described with reference to the drawings.
- As shown in
FIGS. 1 and2 , the shoe sole includes theoutsole 1 and themidsole 2. Note thatFIGS. 1 to 5 do not show small grooves (so called "design") formed in the tread surface of theoutsole 1. - As indicated by the regular dots in
FIG. 3 , theoutsole 1 is arranged over the front foot section F and the rear foot section R. Theoutsole 1 is formed by a foamed body or a non-foamed body of a rubber, for example, and has atread surface 1s (FIG. 7A ) to be in contact with the road surface. Note that inFIG. 3 , theoutsole 1 is shaded with regular large dots. - The
midsole 2 is formed by a foamed body of a resin such as EVA, for example, and is arranged on theoutsole 1, as shown inFIG. 2 , for absorbing the impact upon landing. Therefore, themidsole 2 is formed to be thicker than theoutsole 1. - As shown in
FIGS. 1 to 3 , alower surface 2u (FIG. 7A ) of themidsole 2 is provided with thediagonal groove 4 and thetransversal groove 5 to be described later, and with theoutsole 1 divided into a plurality of parts. As shown in these figures, themidsole 2 may be exposed in the central section Rc of the rear foot section R and/or the arch section M. - As clearly shown in
FIG. 3 , theoutsole 1 is divided into pieces arranged in the front foot section F and in the rear foot section R, thereby leaving uncovered the arch section M, and is formed in the rear foot section R in a U shape in which the central section Rc is cut out. That is, in the central section Rc of the rear foot section R, theoutsole 1 is not provided on the surface of themidsole 2. - Here, "a U shape in which the central section Rc of the
outsole 1 is cut out" includes arrangements where theoutsole 1 is divided into a plurality of parts in the rear foot section R by a plurality of diagonal andtransversal grooves outsole 1 is absent in the central section Rc and that theoutsole 1 at the anterior end of the rear foot section R is divided into medial and lateral pieces by thediagonal groove 4. - Note that in the elliptical area of the central section Rc, the
midsole 2 may be slightly dented. - In
FIGS. 1 to 3 , the bottom surfaces of thediagonal groove 4 and thetransversal groove 5 are shaded with irregular, fine dots. - In the
medial side section 20 of the arch section M of themidsole 2, the central section Rc of the rear foot section R of themidsole 2, and thelateral side section 11 of theoutsole 1, thediagonal groove 4 extends in a diagonal front-rear direction from the medial edge on the medial side IN of the arch section M to the lateral edge on the lateral side OUT of the rear foot section R. - The depth of the deepest portion of the
diagonal groove 4 in the central section Rc is preferably about 5 mm to about 10 mm, for example, and the depth of the deepest portion of thediagonal groove 4 in thelateral side section 11 is preferably about 5 mm to about 15 mm, for example. This is because the advantageous effects such as the light weight cannot be obtained sufficiently if the depth is too small, whereas the stable foot support cannot be obtained if the depth is too large. - The width of the
diagonal groove 4 in the central section Rc is preferably about 5 mm to about 15 mm, for example, except for the area of thetransversal groove 5. The torsional rigidity lowers significantly if the width of the groove is too large, whereas the advantageous effects such as the light weight cannot be obtained if the width of the groove is small. - As shown in
FIG. 9 , thediagonal groove 4 does not need to extend to the medial edge on the medial side IN in the arch section M. Where thediagonal groove 4 does not extend to themedial side section 20 of themidsole 2 in the arch section M, the anterior end of thediagonal groove 4 may be arranged posterior to the arch section M or the anterior end of the rear foot section R. - Referring to
FIG. 6 , the angle α formed between the subtalar joint axis A1 and the longitudinal axis A2 is said to be 23°±11°. Now, the longitudinal axis A2 is represented by a straight line connecting between thecenter 04 of the heel and the middle point 03 between the center of the big-toe ball O1 and the center of the little-toe ball 05. - On the other hand, the subtalar joint axis A1 is represented by a straight line connecting between the
head 06 of the talus and thecalcaneus lateral tubercle 07. - The
diagonal groove 4 is formed along the subtalar joint axis A1. That is, inFIG. 5 , the angle β formed by the longitudinal axis A2 and the virtual center line Lc of thediagonal groove 4 is set in the range of 12° to 35°, and is set to about 30° in the present embodiment, for example. - The virtual intersection point O between the center line Lc and the longitudinal axis A2 is set in a region from the rear half section of the arch section M to the front half section Rf of the rear foot section R. Represented by a dimensional proportion, the virtual intersection point O of
FIG. 5 is set in a range of 21% to 43% of the full length of the longitudinal axis A2 of the shoe sole from the posterior end. Thediagonal groove 4 extends anterior and medial to the intersection point O and extends posterior and lateral to the intersection point O. - In the present embodiment, the position of the virtual intersection point O is provided in the central section Rc of the rear foot section R, and is arranged anterior to the centroid G of the central section Rc. With such an arrangement, the
diagonal groove 4 is arranged over the subtalar joint axis A1 (FIG. 6 ). Note that the centroid G refers to the center of the planar shape of the central section Rc. - The
diagonal groove 4 includes thefront section 4F anterior to the intersection point O, and therear section 4B posterior to the intersection point O. The volume Vb of thediagonal groove 4 in therear section 4B is greater than the volume Vf of thediagonal groove 4 in thefront section 4F. - Now, the volume Vb, Vf of the
diagonal groove 4 is the cross-sectional area of thediagonal groove 4 multiplied by the length of thediagonal groove 4 across the corresponding section. Therefore, thediagonal groove 4 in the arch section M is shallow, for example, and the average value of the cross-sectional area perpendicular to the center line Lc is as shown inFIGS. 8A to 8C , where the average value of the cross-sectional area of thediagonal groove 4 in the arch section M is smaller than the average value of the cross-sectional area of thediagonal groove 4 in the central section Rc of the rear foot section R of themidsole 2. - In the present embodiment, the depth of the
diagonal groove 4 in the arch section M ofFIG. 2 gradually decreases as thegroove 4 extends in the diagonally anterior direction. The cross-sectional area of thediagonal groove 4 may be largest in the central section Rc of the rear foot section R ofFIG. 7A , and the cross-sectional area of thediagonal groove 4 may be slightly smaller in a rear portion of the rear foot section R ofFIG. 7B . - In
FIG. 5 , thediagonal groove 4 formed in the central section Rc of the rear foot section R of themidsole 2 is defined by one pair of first and second edge lines L1 and L2 which are parallel to and facing each other. On the other hand, thediagonal groove 4 formed in theoutsole 1 is defined by one pair of third and fourth edge lines L3 and L4 which are parallel to and facing each other. - While the third and fourth edge lines L3 and L4 are generally parallel to the first and second edge lines L1 and L2, respectively, in the present embodiment, the third and fourth edge lines L3 and L4 may be formed to flare (gradually widen in width therebetween) with an angle greater than the angle formed by the first and second edge lines L1 and L2 as shown in
FIG. 9 . That is, thediagonal groove 4 in thelateral side section 11 of theoutsole 1 may be formed to flare toward the diagonally posterior direction. - While the
transversal groove 5 ofFIG. 5 extends in a direction perpendicular to thediagonal groove 4, and thetransversal groove 5 is arranged so as to be perpendicular to thediagonal groove 4 in the present embodiment, the angle formed between thetransversal groove 5 and thediagonal groove 4 may be set to about 70° to about 90°. - The
transversal groove 5 divides theoutsole 1 into pieces in themedial side section 10 and in thelateral side section 11 of theU-shaped outsole 1. Note that as shown inFIG. 9 , thetransversal groove 5 may be formed to flare (gradually widen) in the direction from the medial side IN toward the lateral side OUT. - As indicated by the dots in
FIG. 4 , thereinforcement member 3 formed by a non-foamed body of a resin is attached on the lower surface of themidsole 2 in the arch section M. Thereinforcement member 3 has thediagonal section 31 extending generally parallel to thediagonal groove 4, and thediagonal section 31 is arranged in the vicinity of thediagonal groove 4 and anterior to thediagonal groove 4. Thediagonal section 31 may be extending from the arch section M to at least the posterior end of the front foot section F. - The
reinforcement member 3 further includes thelateral side section 32 extending along the lateral side of themidsole 2 in the arch section M. An exposedsection 22, which is the lower surface of themidsole 2, is exposed between thelateral side section 32 and thediagonal section 31. - A connecting
section 33 is provided to bridge between thediagonal section 31 and thelateral side section 32 so as to connect between thesesections section 22 of themidsole 2 is exposed in the area surrounded by thediagonal section 31, thelateral side section 32 and the connectingsection 33. - The
diagonal section 31 only needs to be arranged along thediagonal groove 4 above thediagonal groove 4, and therefore even areinforcement member 3 that covers generally the entire area of the arch section M, as shown inFIG. 9 , has adiagonal section 31. - While preferred embodiments have been described above with reference to the drawings, various obvious changes and modifications will readily occur to those skilled in the art upon reading the present specification.
- For example, the
outsole 1 may be provided generally over the entire length from the front foot section F to the rear foot section R and across the entire area thereof. Moreover, in the arch section M or the rear foot section R, themidsole 2 may not be exposed. Thereinforcement member 3 and thetransversal groove 5 may be absent. - Thus, such changes and modifications are deemed to fall within the scope of the present invention, which is defined by the appended claims.
- The present invention is applicable to various athletic shoes such as for running.
-
- 1:
Outsole 1s: Tread surface 10: Medial side section 11: Lateral side section - 2:
Midsole 2u: Lower surface 20: Medial side section 22: Exposed section - 3: Reinforcement member 31: Diagonal section 32: Lateral side section 33: Connecting section
- 4:
Diagonal groove 4F:Front section 4B: Rear section - 5: Transversal groove
- A1: Subtalar joint axis A2: Longitudinal axis
- Lc: Center line L1 to L4: First to fourth lines
- F: Front foot section
- R: Rear foot section Rc: Central section Rf: Front half section
- M: Arch section Mb: Rear half section
- O: Intersection point
- O1: Big-toe ball O2: little-toe ball
- IN: Medial side OUT: Lateral side
- α, β: Angle
Claims (9)
- A shoe sole comprising: an outsole (1) having a tread surface to be in contact with a road surface; and a midsole (2) arranged on the outsole (1), the shoe sole supporting a foot in a front foot section (F), an arch section (M), and a rear foot section (R), wherein:in a central section and a lateral side section of a rear foot section (R) of the shoe sole, a diagonal groove (4) is formed extending in a diagonal front-rear direction in the rear foot section (R) to an outer edge of a lateral side of the rear foot section (R);an angle (β), formed by a virtual center line (Lc) of the diagonal groove (4) and a longitudinal axis (A2) connecting between a center (04) of a heel and a middle point (03) between a big-toe ball (O1 and a little-toe ball (05), is set in a range of 12° to 35°; anda virtual intersection point (O) between the longitudinal axis (A2) and the center line (Lc) is set within a range of 21% to 43% of a full length of the longitudinal axis (A2) of the shoe sole from a posterior end of the shoe sole, the diagonal groove (4) extending to a point anterior and medial to the intersection point (O);the outsole (1) is divided into pieces arranged in the front foot section (F) and in the rear foot section (R), thereby leaving uncovered the arch section (M), andcharacterized in that the outsole (1) is formed in the rear foot section (R) in a U shape, with a central section (Rc) cut out between a medial side (IN) and a lateral side (OUT) of the foot;the midsole (2) is exposed in the arch section (M) and the central section (Rc) of the rear foot section (R);the diagonal groove (4) is formed in the midsole (2) in the central section (Rc) of the rear foot section (R) and in the outsole (1) in a lateral side section (11) of the rear foot section (R), the diagonal groove (4) extending in a diagonal front-rear direction in the rear foot section (R) to an outer edge of the lateral side (OUT) of the rear foot section (R).
- The shoe sole according to claim 1, wherein a virtual intersection point (O) between the longitudinal axis (A2) and the center line (Lc) is arranged within a region from a rear half section (Mb) of the arch section (M) to a front half section (Rf) of the rear foot section (R).
- The shoe sole according to claim 2, wherein a position of the virtual intersection point (O) is arranged anterior to a centroid (G) of the central section (Rc).
- The shoe sole according to claim 3, wherein:the diagonal groove (4) formed in the midsole (2) in the central section (Rc) of the rear foot section (R) is defined by one pair of first and second edge lines (L1) and (L2) which face each other;the diagonal groove (4) formed in the outsole (1) is defined by one pair of third and fourth edge lines (L3) and (L4) which face each other; andthe third and fourth edge lines (L3) and (L4) are generally parallel to the first and second edge lines (L1) and (L2), respectively, or flare to form an angle therebetween larger than an angle formed by the first and second edge lines (L1) and (L2).
- The shoe sole according to any one of claims 1 to 4, wherein:the diagonal groove (4) extends to a medial side section (20) of the midsole (2) in the arch section (M); andan average value of a cross-sectional area perpendicular to the center line (Lc) of the diagonal groove (4) in the arch section (M) is smaller than an average value of a cross-sectional area perpendicular to the center line (Lc) of the diagonal groove (4) in the central section (Rc) of the rear foot section (R) in the midsole (2).
- The shoe sole according to any one of claims 1 to 4, wherein:the diagonal groove (4) is unextended to an edge of the medial side section (20) of the midsole (2) in the arch section (M); anda tip of the diagonal groove (4) is arranged posterior to an anterior end of the arch section (M).
- The shoe sole according to any one of claims 1 to 6, wherein the diagonal groove (4) of the outsole (1) flares toward a diagonally posterior direction.
- The shoe sole according to any one of claims 1 to 7, further comprising a transversal groove perpendicular to the diagonal groove (4).
- The shoe sole according to any one of claims 1 to 8, wherein:a reinforcement member (3) formed by a non-foamed body of a resin is attached to a lower surface of the midsole (2) in the arch section (M); andthe reinforcement member (3) has a diagonal section (31) extending generally parallel to the diagonal groove (4), and the diagonal section (31) is arranged in a vicinity of the diagonal groove (4) and anterior to the diagonal groove (4).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2012/062010 WO2013168259A1 (en) | 2012-05-10 | 2012-05-10 | Shoe soles having inclined grooves |
Publications (3)
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EP2848142A1 EP2848142A1 (en) | 2015-03-18 |
EP2848142A4 EP2848142A4 (en) | 2016-03-30 |
EP2848142B1 true EP2848142B1 (en) | 2017-09-13 |
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EP12876174.9A Active EP2848142B1 (en) | 2012-05-10 | 2012-05-10 | Shoe soles having inclined grooves |
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US (1) | US20150135558A1 (en) |
EP (1) | EP2848142B1 (en) |
JP (1) | JP5190565B1 (en) |
WO (1) | WO2013168259A1 (en) |
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WO2013168259A1 (en) | 2013-11-14 |
EP2848142A1 (en) | 2015-03-18 |
JP5190565B1 (en) | 2013-04-24 |
EP2848142A4 (en) | 2016-03-30 |
JPWO2013168259A1 (en) | 2015-12-24 |
US20150135558A1 (en) | 2015-05-21 |
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