Sole and shoe with sole

A shoe sole comprises a bottom surface including a plurality of grooves arranged in a longitudinal direction of the shoe sole for engaging the engagement parts 6a, 6b that are formed parallel to the pedal shaft 8 of the bicycle pedal, and a protrusion having a ground contact surface between the grooves adjacent in the longitudinal direction, the sole characterized in that the protrusion has a width W2 in the longitudinal direction on an inner side in the left-right direction with respect to both feet of a wearer that is wider than a width W1 on an outer side in the left-right direction with respect to both feet of a wearer.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims priority to Japanese Patent Application No. 2019-128405, filed on Jul. 10, 2019. The entire disclosure of Japanese Patent Application No. 2019-128405 is hereby incorporated herein by reference.

BACKGROUND

Technical Field

The present invention generally relates to a shoe sole used for a bicycle pedal and a shoe provided with the shoe sole.

Background Information

Some bicycle pedals include front and rear engagement parts (projections or end faces of the frame of the pedal) extending in the left-right direction parallel to the pedal shaft. In order to prevent the shoe sole coming off the pedal when the shoe sole is placed on the bicycle pedal and pedals the bicycle pedal, the bottom surface of the shoe sole is provided with a plurality of grooves that are formed at intervals in the longitudinal direction so that the plurality of grooves engages the pair of front and rear engagement parts. These grooves are formed of grooves extending in the left-right direction that is a direction perpendicular to the longitudinal direction of the shoe sole. For example, such a shoe sole is disclosed in Japanese Application Laid-Open No. 2010-268888 (hereinafter referred to as Patent Document 1) and as seen in FIG. 5 of Patent Document 1.

SUMMARY

According to the configuration of Patent Document 1, since the direction in the pair of front and rear engagement parts and the direction in which the plurality of grooves are formed are the same direction, the front engagement parts, which are located on the front side over the entire left and right length, will be located in the groove with little gap. At the same time, the rear engagement part may be engaged in the groove located on the rear side over the entire left and right length with a small gap. In this case, the locking force becomes extremely large resulting in there being a disadvantage in that the operation feeling is not good because the shoe sole is too firmly fixed to the pedal.

Also, when the pedal is stepped on at the portion of the sole of the foot behind the thumb ball of the foot, the wearer's foot tends to open and turn slightly outward. In addition, when the pedal is stepped on at the front side of the sole, the wearer's foot tends to be turn slightly inward. Therefore, if the direction in which the plurality of grooves are formed in a direction intersecting with the direction in the engagement part of the pedal, as described above, then the grooves can only partially engage the engagement part of the pedal, and the pedaling force is not effectively transmitted to the pedal, which leaves room for improvement.

The shoe sole and the shoe provided with the shoe sole of the present disclosure have been made in view of the above-described circumstances. Thus, the shoe sole and the shoe of the present disclosure provides a shoe sole and a shoe provided with a shoe sole, which not only can be reliably engaged with a pedal but also can be reliably engaged even if the wearer turns the wearer's foot according to a tendency of the wearer.

The shoe sole of the present disclosure comprises a bottom surface including a plurality of grooves arranged in a longitudinal direction of the shoe sole for engaging the engagement parts that are formed parallel to the pedal shaft of the bicycle pedal, and a protrusion having a ground contact surface between the grooves adjacent in the longitudinal direction, the sole characterized in that the protrusion has a width in the longitudinal direction on an inner side in the left-right direction with respect to both feet of a wearer that is wider than a width on an outer side in the left-right direction with respect to both feet of the wearer.

According to the present disclosure, the protrusion has a width in the longitudinal direction on the outer side in the left-right direction that is narrower than a width in the longitudinal direction on the inner side in the left-right direction. Thereby, the grooves extend in a direction intersecting the left-right direction. One of the grooves is engaged to the front or rear engagement part of the bicycle pedal over the entire left and right length when the grooves are respectively engaged to the front and rear engagement parts of the bicycle pedal. While, at the same time, the other groove is not engaged to the other engagement part on the rear side or the front side of the bicycle pedal over the entire left and right length. Therefore, the engaging force can be generated appropriately. Further, even when the shoe sole is engaged to the bicycle pedal with the foot slightly opened and turned outward or turned inward, at least one of the front and rear engagement parts of the bicycle pedal reliably be engaged with the groove.

In addition, in the shoe sole of the present disclosure, the plurality of grooves includes at least one first groove formed so that a center line extends in the left-right direction that is perpendicular to the center line of the shoe sole in the longitudinal direction and a plurality of second grooves disposed before and after the first groove respectively, and the plurality of second grooves is formed so that center lines of second grooves intersect the left-right direction. The center lines of the plurality of the second grooves on a front side of the first groove is inclined rearwardly towards the outer side in the left-right direction with respect to both feet of the wearer. The center lines of the plurality of the second grooves on a rear side of the first groove is inclined forwardly towards the outer side in the left-right direction with respect to both feet of the wearer. The first groove can be disposed in a region including spaced 20% to and including spaced 50% of a total length of the shoe sole from a front end of the shoe sole.

As described above, the first groove is arranged in the region including spaced 20% to and including spaced 50% of the total length of the sole from the front end of the shoe sole. The plurality of second grooves have an opposite inclination direction before and after the first groove, respectively. Therefore, even if the direction of the shoe sole stepping on the bicycle pedal changes to be turned outward or turned inward, one of the second grooves on the front side of the first groove and the second grooves on the rear side of the first groove is in alignment with the direction of the engagement part of the bicycle pedal. It is possible for the one of the second groove (corresponding to the one of the engagement part) to be securely engaged to the one engagement part of the bicycle pedal.

In the shoe sole of the present disclosure, the first groove can be arranged in a region corresponding to a thumb ball of the wearer's foot.

As described above, by arranging the first groove in the region corresponding to the thumb ball of the foot where the force of the foot is relatively easy to apply, it is easy to reliably engage the second groove to the bicycle pedal.

Further, in the shoe sole of the present disclosure, the center lines of the second grooves can be inclined at an angle including 1 degree to and including 3 degrees with respect to the center line of the first groove.

As described above, since the center lines of the second grooves are inclined in a small range including 1 degree to and including 3 degrees with respect to the center line of the first groove, even when the wearer's foot moves back or forth, such that the second groove can be aligned according to the direction of the foot.

Furthermore, the shoe can be provided with the shoe sole described above.

As in the present disclosure, since the shoe sole has a protrusion in which the width in the longitudinal direction on the outer side in the left-right direction is narrower than the width in the longitudinal direction on the inner side in the left-right direction, the grooves can be appropriately engaged with the pedal. In addition, it is possible to provide a shoe sole and a shoe provided with the shoe sole, which can reliably hold the pedal in the groove in accordance with a tendency of the wearer to turn the foot.

DETAILED DESCRIPTION OF EMBODIMENTS

Hereinafter, selected embodiments will be described with reference to the drawings. It will be apparent to those skilled in the bicycle field from this disclosure that the following descriptions of the embodiments are provided for illustration only and not for the purpose of limiting the invention as defined by the appended claims and their equivalents.

FIGS.1to9show a shoe sole1in accordance with one illustrative embodiment of the present disclosure. The shoe sole1shows the left one of a pair of left-right symmetric ones, in which the right one is omitted. The shoe3is constituted by providing the shoe sole1with an upper part2shown by a two-dot chain line inFIG.6. The shoe sole1includes an outsole4and a midsole5fixed on the outsole4with an adhesive or the like. In addition, the sole1has a countermeasure so that when the pedal6is stepped on so that the pedaling force from the sole1to a bicycle pedal (hereinafter simply referred to as a pedal)6(seeFIG.10) can be efficiently transmitted. The shoe sole has hardness that does not deform due to force.

The outsole4is made of, for example, an elastic polymer material such as synthetic rubber or polyurethane, and has an outer shape formed in a foot shape. Further, the bottom surface (lower surface) of the outsole4includes a plurality of grooves7for engaging the front and rear engagement parts6aand6bof the pedal6, which are later described, in a longitudinal direction LD of the shoe sole1.

As shown inFIG.10, the pedal6has a U-shaped frame portion6A, a pair of left and right connection portions6B,6B connecting the insides of the frame portion6A in the longitudinal direction, and a mounting boss6C protruding inwardly from the left-right insides of the connecting portion6B located inside the left-right direction and attached to a shaft8. The frame portion6A includes a pair of front and rear engagement parts6aand6bextending in the left-right direction parallel to the shaft8. In this embodiment, the pair of front and rear engagement parts6aand6bare plate-like members extending linearly in the left-right direction, but can include a plurality of protrusions arranged at intervals in the left-right direction. The projections can be formed integrally with the engagement part, or can be formed by screwing a plurality of separate rod-shaped members into the pedal6at intervals along the left-right direction. In this embodiment, the thickness of each of the engagement parts6aor6bin the longitudinal direction is 2.5 mm, but is preferably in a range including 1.5 mm to and including 3 mm.

The midsole5is made of, for example, EVA (ethylene-vinyl acetate copolymer), and has an outer shape in a foot shape.

The outsole4includes a forefoot4F located on the front side, a posterior foot4R located on the rear side, and a midfoot4M located between the forefoot4F and the posterior foot4R. The plurality of grooves7are formed in a portion including the forefoot4F that is excluded the front end of the forefoot4F and in the forefoot side of the midfoot4M. In addition, a front end4fof the forefoot4F, a rear end4rof the posterior foot4R, and a portion placed between them which portion includes protrusions9, recesses11, and protrusions10, described later include ground contact surfaces that contact the ground when the wearer is walking. It is preferable that the ground surface ratio of the ground contact surface corresponding to the wearer's outsole4positions of the toe phalanges and metatarsal be in the range including 50% to and including 75%.

Each of the plurality of (seven inFIG.1) grooves7has a constant width H in the longitudinal direction from the left-right inner end to the left-right outer end based on both feet of the wearer (seeFIG.1). Therefore, the front end and the rear end of the groove7are parallel. Further, the width H in the longitudinal direction is preferably larger than a thickness in the longitudinal direction of the engagement part6aor6bof the pedal6, for example, preferably in a range including 5 mm to and including 8 mm, and more preferably in a range including 6 mm to and including 8 mm.

Further, the plurality of grooves7includes one linear first groove71that is formed so that a center line C extends in the left-right direction perpendicular to the sole center line of the shoe sole1, which extends in the longitudinal direction, and the plurality of grooves7includes a plurality of linear second grooves72to77(a total of six grooves including two on the front side and four on the rear side inFIG.1) that is respectively arranged before and after in the longitudinal direction of the first groove71and that are formed so that center lines C1to C6intersects the left-right direction. The center lines C1and C2of the plurality of (two) second grooves72and73on the front side are inclined rearwardly towards the outside in the left-right directions, and the center lines C3, C4, C5, and C6of the plurality of (four grooves) second grooves74,75,76and77on the rear side are inclined forwardly towards the outside in the left-right directions. In other words, the second groove72is inclined at an angle θ1(the angle θ1is 2.5 degrees) with respect to the first groove71, and the second groove73is inclined at an angle θ1(the angle θ1is 2.5 degrees) with respect to the second groove72. In addition, the second groove74is inclined at an angle θ2(the angle θ2is 2.5 degrees at the same angle as θ1) with respect to the first groove71, the second groove75is inclined at an angle θ2(the angle θ2is 2.5 degrees at the same angle as θ1) with respect to the second groove74, the second groove76is inclined at an angle θ2(the angle θ2is 2.5 degrees at the same angle as θ1) with respect to the second groove75, and the second groove77is inclined at an angle θ2(the angle θ2is 2.5 degrees at the same angle as θ1) with respect to the second groove76. Thus, by setting the angles θ1and θ2equal to 2.5 degrees, as described above, when the radially drawn center lines C to C6are extended to the right side, it is possible for them to converge at one point. The angles θ1and θ2are not limited to 2.5 degrees, but can be set to an arbitrary numerical value in the range including 1 degree to and including 3 degrees. The center line of the sole in the longitudinal direction of the shoe sole1is a straight line connecting the front end and the rear end of the shoe sole1.

Further, the first groove71is preferably arranged in a region including spaced 20% to and including spaced 50% of the total length L from the front end of the shoe sole1towards the rear end from the front end of the sole1. More preferably, the region where the first groove71is arranged is a region corresponding to the thumb ball of the foot (the range including 20% to and including 40% of the total length L of the sole1from the front end of the sole1). In this embodiment, the first groove71is arranged in a range including 30% to and including 40% of the total length L of the sole1from the front end of the sole1. As described above, the first grooves71are arranged in the region including spaced 20% to and including spaced 50% of the total length L of the shoe sole1from the front end of the shoe sole1, and the plurality of (for example, seven grooves) the second grooves72to77are respectively provided before and after the first groove71, so that even if the position of the sole1for stepping on the pedal6is changed back and forth, at least one of the second grooves72and73on the front side of the first groove71and the second grooves74to76on the rear side of the first groove71can be reliably engaged with the pedal76.

The first groove71is formed between the linear protrusions9,9that are disposed in front and rear. The linear protrusions9have a ground contact surface extending in the left-right direction, and the width of each of the protrusions9in the longitudinal direction is wider than the width of the first groove71. In addition, each of the protrusions9has a width W2in the longitudinal direction on the inner side in the left-right direction with respect to both feet of the wearer. The width W2is wider than a width W1in the longitudinal direction on the outer side in the left-right direction with respect to both feet of the wearer. Specifically, the width in the longitudinal direction of each of the protrusions9is tapered to narrower (smaller) toward a lateral outside end from a lateral inside end. The second grooves72,73,74and75are also formed between the protrusions9,9in the same way. The second groove77, which is the first groove from the rear is formed between the left and right protrusions10,10on the front side and the left and right protrusions10,10on the rear side. The protrusions10are arranged at both left and right end portions and where there is no intermediate part in the left-right direction of the protrusion9. The second groove76, which is the second groove from the rear is formed between the protrusion9positioned on the front side and the left and right protrusions10,10positioned on the rear side.

Also, a plurality of (four recesses inFIG.1) first recesses11is formed at intervals in the left-right direction in each of the protrusions9. The plurality of the first recesses11formed on the protrusions9formed upper side and the plurality of the first recesses11formed on the protrusions9formed lower side are formed so as to be shifted in the longitudinal direction. Each of the first recesses is formed in a three-way shuriken shape including three flat surfaces11a,11band11cthat extend in three directions. Of these flat surfaces11a,11b,11c, the flat surface11bextending forward protrudes into the second groove73formed in the upper side and the flat surface11cextending backward protrudes into the second groove72formed in the lower side. The three flat surfaces11a,11b,11care lower than the upper surface of the projection9and higher than the bottom surfaces of the first groove71and the second grooves72to77. An annular groove11M having a three-way shuriken shape is formed at a center of the first recesses11. A plurality of second recesses11A, in which the grooves11M are not formed, are formed in three rear rows. Each of the second recesses11A has the same outer shape and size as the first recesses. Further, in the left-right direction the number of the second recesses11A located on the rear side is smaller than the number of the second recesses11A located on the front side.

As described above, each protrusion9has the width W2in the longitudinal direction on the inner side in the left-right direction with respect to both feet of the wearer. The width W2is wider than the width W1in the longitudinal direction on the outer side in the left-right direction with respect to both feet of the wearer (SeeFIGS.2and10). With this configuration, the first groove71and the second grooves72to77can be more reliably engaged with the engagement parts6aand6bat the front and rear of the pedal6according to the tendency of the opening of the foot. In addition, by providing a plurality of the second grooves72,73and74to77disposed before and after the first groove71and having opposite inclination directions, respectively. The direction of the shoe sole on which the pedal6is stepped on changes to turn outward or turn inward. Even in such a case, one of the second grooves72,73disposed on the front side of the first groove71and the second grooves74to77disposed on the rear side of the first groove71is engaged with the engagement part6aor6bof the pedal6. Thus, one of the engagement part6aor6bcan surely engage with one of the second grooves72,73and74to77corresponding the engagement part6aor6b.

FIGS.10to12show a state where the first groove and the second groove (71,77inFIG.10) of the shoe sole1are engaged to the pair of front and rear engagement parts6a,6bof the pedal6.FIGS.10to12show views of the pedal6as viewed from below. InFIG.10, when the pedal6is stepped on at the part of the shoe sole1on the rear side of the thumb ball of the foot, the foot is opened slightly outward. In this case, the forefoot4F of the shoe sole1is directed outward. The second groove77is the third groove from the front side among the second grooves74to77on the rear side of the first groove71directs in the direction which is the substantially same left-right direction of the rear engagement part6bof the pedal6. Thus, the rear engagement part6bis engaged with the second groove77over the entire left and right region. On the other hand, since the first groove71has an inclination that intersects with the left-right direction of the front engagement part6aof the pedal6(the inclination so that the inside is more forward). Thereby, only the outside part of the first groove71in the left-right direction is engaged with the outer end of the front engagement part6aof the pedal6in the left-right direction. Thus, the engaging force acting on the front engagement part6aof the pedal6is suppressed to be smaller than the engaging force acting on the rear engagement part6bof the pedal6so that the engaging force is appropriately generated.

InFIG.11, the pedal6is stepped on with the foot in a slightly outward turned state and the foot returned towards a substantially normal direction as compared toFIG.10. Further, the pedal6is stepped on at the portion of the shoe sole1on the front side than shown inFIG.10. In this case, since the front side part of the sole1is directed slightly outward turned, the second groove75, the second from the front side among the second grooves74to77on the rear side of the first groove71, is directed to the left-right directions in the substantially same direction as the rear engagement part6bof the pedal6so that the rear engagement part6bis engaged with the second groove75over the entire left and right region. On the other hand, since the second groove73, which is located at the first from the front of the second grooves on the front side of the first groove71, has an inclined posture that intersects with the left-right direction of the front engagement part6aof the pedal6(the inclination is forwardly towards the inside). Therefore, only the outside part of the second groove73is engaged with the outer end of the front engagement part6aof the pedal6in the left-right direction. Thus, the engaging force acting on the front engagement part6aof the pedal6is suppressed to be smaller than the engaging force acting on the rear engagement part6aof the pedal6so that the engaging force can be appropriately generated.

InFIG.12, the pedal6is stepped on with the foot closed slightly inward turned state. In this case, the forefoot4F of the shoe sole1is directed slightly inward turned. The second groove73, which is located at the first from the front side among the second grooves72,73on the front side of the first groove71, is directed in the left-right direction which is the substantially same direction as the front engagement part6aof the pedal6. Thus, the front engagement part6ais engaged with the second groove73over the entire left and right region. On the other hand, since the second groove75, the second from the front side among the second grooves74to77on the rear side of the first groove71, has inclined posture that intersects with the left-right direction of the rear engagement part6bof the pedal6(the inclination is rearwardly towards the inside). Therefore, the outside part of the second groove75is engaged with the outer end of the rear engagement part6bof the pedal6in the left-right direction. Thus, the engaging force acting on the rear engagement part6bof the pedal6is suppressed to be smaller than the engaging force acting on the front engagement part6aof the pedal6so that the engaging force can be appropriately generated.

In the present invention, by setting the inclination angles of the second grooves72to77to a small angle range of 1 degree to 3 degrees. Even when the wearer's foot moves back and forth, either of the second grooves72,73or the second grooves74to77can be adjusted to the direction of the foot. Incidentally, the pedal6will be used based on an entire length of the sole1and an interval between the grooves71to77formed in the sole1.

The shoe sole and shoes of the present invention are not limited to the above embodiments.

In the embodiment, only one of the first groove71is provided, but two or more can be provided, or it can be omitted.

Further, in the above-described embodiment, the inclination angles of all the second grooves72to77are set to be the same angle so that all the center lines converge at one point when the center lines are extended outward. However, by varying the inclination angles of some portion of the second grooves to be different from the inclination angles of the other second grooves, when the line extends outward, the second grooves converge at two or more points or can be configured not to converge at all.

In the above-described embodiment, while the number of the second grooves72and73on the upper side of the first groove71is smaller than the number of the second grooves74to77on the lower side of the first groove71. However, the number of grooves72,73,74to77may be the same or, the number of second grooves on the upper side of the first groove can be larger than the number of the second grooves of the lower side the first groove.