JP4886922B2 - Upper structure for football shoes - Google Patents

Abstract

An upper structure for a soccer shoe 1 includes an upper 4. Upper material for covering a medial upper side region 40 of the upper 4 disposed at the upper position of the medial side of the upper 4 is formed of material M such that the ball speed V 2 is less than or equal to 950 rpm immediately after rebound of the ball B when the diagonal impact test is conducted in which the ball B impacts the material M diagonally. The medial upper side region 40 is preferably located at the minimal spin shot area NR that covers the navicular bone NB, the medial cuneiform bone MC and the middle cunei form bone IC of the foot of the wearer. The diagonal impact test is conducted in such a way that the ball B impacts the material M at a speed V 1 of 23.0 to 25.0m/s, at a revolution of 0 to 25rpm and at an angle ± of 29 to 33 degrees relative to the surface of the material M with the material M attached to the flat plate HB. The upper material at the medial upper side region 40 is formed of soft polyurethane of a lower hardness of 30 to 50 degrees at Asker A scale.

Description

  The present invention relates to an upper structure that is suitable for football shoes, particularly soccer shoes, and more specifically, it can control the spin characteristics of a ball after kicking, and a general player can easily kick a non-rotating shot. It is related with improvement of the upper structure for making it.

  In general, a soccer shoe is mainly composed of a sole having a plurality of studs on the bottom surface and an upper (top) fixed on the sole. The upper of a soccer shoe is very important because it not only protects the wearer's foot like other sports shoes, but also plays the role of kicking the ball.

  For this reason, various improvements have been made to the upper of soccer shoes. For example, in what is shown in JP-A-8-332101, JP-A-9-28412 and JP-T-2004-520113, a large number of convex parts, concave parts, resin protrusions or ridges are formed on the upper surface. Thus, the frictional force of the upper surface with respect to the ball is increased, thereby increasing the rotation speed of the ball after kicking (that is, applying a spin to the ball) to increase the bending of the ball.

  In the table shown in Japanese Patent Publication No. 10-501725, a ball contact pad made of a highly frictional material having elasticity is provided on the upper surface. This ball contact pad consists of a top layer and a bottom layer that are spaced apart from each other via a web. The top layer and the web that are displaced during the ball impact use the movement when returning to the original position after the ball impact. And trying to give the ball a spin.

  Japanese Patent Application Publication No. 2007-509655 discloses that a coating agent is applied to the upper surface to improve the dry friction coefficient of the upper surface and improve grip.

  In what is shown in JP-T-2001-523499, an insert for forming a ball kick surface of the upper in a concave shape is provided in the upper. In this case, the radius of curvature of the concave ball kicking surface is substantially the same as or slightly larger than the radius of the ball, and by matching the ball kicking surface with the shape of the ball, the contact area with the ball is increased. It is trying to increase the accuracy of kicking the ball.

  JP-A-8-332101, JP-A-9-28412, JP-T-2004-520113, JP-T-10-501725, and JP-T-2007-509655 either spin a ball. The main thing of the thing shown to the said special table 2001-523499 gazette is to increase the contact area with a ball | bowl.

  On the other hand, recently, kicks called “non-rotating shoots” have been used by leading soccer players. This non-rotating chute is a kicking method that keeps the ball from rotating as much as possible, and the kicked ball moves unpredictably due to changes that shake (or shake) during flight. It is very difficult for the goalkeeper to catch. Here, in this specification, “non-rotating chute” is defined as a chute that draws an unpredictable trajectory by moving in a flying manner at a certain rotational speed or less.

  Until now, such non-rotating shoots have been left to the skill of the player kicking the ball, and no non-rotating shoot has been tackled from the viewpoint of soccer shoes. None of the shoes described in any of the above publications is designed to prevent the ball from rotating.

  The present invention has been made in view of such conventional circumstances, and the problem to be solved by the present invention is that the spin characteristics of the ball after kicking can be controlled, and even a general player can easily kick a non-rotating shot. We are trying to provide an upper structure that will be able to. The present invention is also intended to provide an upper structure that allows even a general player to easily separate a spin shoot such as a curve kick or an instep kick from a non-rotating shoot.

  The inventors of the present application started by verifying a non-rotating chute. A first-class soccer player actually kicked a non-rotating shot and examined under what conditions the non-rotating shot was generated.

  The first observer is placed at the kick point where the ball to be kicked by the player is placed, and the target point of the kicked ball is placed 50 m away from the kick point, and the second target point is reached. The first and second observers observe the movement of the ball before the ball that the player actually kicks and reaches the target point, and both observers Only the judged one was finally judged as a non-rotating chute. In addition, when determining whether or not it is a non-rotating shoot, if the kicked ball draws a trajectory that does not bend in one direction and sways while shaking (or shakes), in other words, the ball The case where an unpredictable trajectory was drawn by moving in a blurry manner during the flight of the aircraft was defined as “no rotation”.

  FIG. 10A shows the data regarding the foot immediately before the ball impact, the data regarding the ball immediately after the ball impact, and the determination of whether or not the non-rotating shot is made for each of the cases where the player has attempted the non-rotating shot 11 times. Results are shown. Note that a blank column in FIG. 10A indicates that no data was obtained. FIGS. 10A and 10B show the ball B immediately before impact and the ball B ′ immediately after impact in a plan view and a side view, respectively, and the reference numerals in the drawings correspond to the reference numerals in FIG. 10A. ing.

In FIG. 10A and FIGS. 10A and 10B, V _F (m / s) indicates the velocity of the foot immediately before the ball impact (Velocity), and V _B (m / s) indicates the ball impact. The velocity (Velocity) of the ball B ′ immediately after is shown. S _A (deg) is an angle formed by the moving direction of the foot with respect to the target direction (x axis) of the ball B when the moving direction of the foot immediately before the ball impact is projected on the horizontal plane (xy plane). (Side Angle) indicates S _A ′ (deg). When the moving direction of the ball B ′ immediately after the ball impact is projected onto the horizontal plane (xy plane), the moving direction of the ball B ′ is the ball B ′. The angle (Side Angle) made with respect to the ultimate target direction (x axis) is shown. B A _(deg), when the projection of the direction of movement of the foot just before ball impact in a vertical plane (x-z plane), the moving direction of the legs represents the angle (Blow Angle) which forms with the horizontal plane, L _A ( deg) indicates an angle (Launch Angle) between the moving direction of the ball B ′ and the horizontal plane when the moving direction of the ball B ′ immediately after the ball impact is projected onto the vertical plane (xz plane). The reason why B _A (deg) is negative in FIG. 10A is that the player is kicking while lowering his / her foot downward. R (rpm) is the rotation speed (Spin Rate) of the ball B ′ immediately after impact.

  From the determination result of whether or not it is a non-rotating chute in FIG. 10A, the ball rotation speed at which the non-rotating chute is obtained is 111 rpm at the maximum. We decided to adopt the upper two significant figures. Therefore, it is determined that the ball rotation speed at which a non-rotating chute is obtained is 110 rpm or less.

  Next, when the player kicked the non-rotating shot, he decided to verify which area of the shoe's upper was in contact with the ball. Gather 10 top soccer players, put sensors along the inner side of each foot surface and the first to fifth toes, and do not rotate with socks on top We asked the player to kick the chute and measure how much pressure was applied to which position of the foot.

  FIG. 7 shows the average value of the measurement results. FIG. 7A is a side view showing the foot pressure distribution on the instep side of the foot, and FIG. 7B shows the foot pressure distribution on the instep portion of the foot. FIG. Here, the left foot is shown as an example.

  As shown in FIG. 7, it was found that the non-rotating chute kicks mainly in the inner side area of the upper instep of the foot. As can be seen by overlapping this inner side region with the skeleton diagram of the left foot shown in FIGS. 5 and 6, the non-rotating chute region NR, which is a relatively high foot pressure region when kicking the non-rotating chute, It can be seen that the region extends from the scaphoid bone NB of the foot to the inner wedge bone MC and the intermediate wedge bone IC. 5 and 6, LC indicates the outer wedge bone, TA indicates the talus, and CA indicates the radius.

  For comparison, the soccer player also kicked a curve kick and an instep kick, and the foot pressure was measured in the same manner.

  FIG. 8A is a side view showing the foot pressure distribution on the instep side of the foot during the curve kick, and FIG. 8B is a plan view showing the foot pressure distribution of the instep portion of the foot during the kick. FIG. 9A is a side view showing the foot pressure distribution on the instep side of the foot during the instep kick, and FIG. 9B shows the foot pressure distribution of the instep portion of the foot during the kick. It is a top view. Here, the left foot is also shown as an example.

  As shown in these figures, both the curve kick and the instep kick are kicked in the inner side area of the toes, and the ball contact area extends from the instep kick to the rear side of the inner side than the instep kick. I found that it was extended.

As can be seen by overlapping these inner inferior regions with the skeletal diagrams of the foot shown in FIGS. 5 and 6, the instep kick region IK includes the first phalanx phalanx DP ₁ to the first heel proximal phalanx. PP ₁ and the first heel metatarsal ME ₁ are areas covered up to the central part, and the curve kick area C includes the instep kick area IK, and further covers the first metatarsal ME ₁ up to the part immediately before the bone bottom. It is.

  Next, the inventors of the present invention calculated the ball rotation speed after the ball collision in the oblique collision test having a high correlation with the phenomenon of the player kicking the ball, and 110 rpm which is the upper limit value of the ball rotation speed during the non-rotating shot. I decided to verify the correspondence.

  FIG. 11 is a diagram for explaining the outline of the oblique collision test. As shown in the figure, a material sheet M, which is an upper material, attached to a human body hardness plate HB was fixed to an iron plate IB. Here, the human body hardness plate is a plate made of vinyl chloride having a hardness corresponding to the human body and having a thickness of 10 mm, and has a hardness of 60 degrees (that is, a hardness of 60 A) on the Asker A scale. The reason why such a human body hardness plate HB is inserted between the material sheet M and the iron plate IB is that the human body receives an impact force acting on the upper during an actual kick.

In FIG. 11, an angle α is an approach angle formed by the surface of the material sheet M when the soccer ball B launched from a soccer ball launching device (not shown) collides with the material sheet M, and the angle β is a collision. The rebound angle that the soccer ball B that rebounds from the material sheet M later makes with the surface of the material sheet M is V ₁ and V ₂ are the collision speed of the ball B and the rebound speed immediately after the collision, respectively. The soccer ball B is made to collide diagonally with an acute angle α with respect to the surface of the material sheet M because the smaller the incident angle, the more easily the ball after the collision is likely to rotate. On the other hand, if the approach angle is too small, the vertical component of the force at the time of the collision will be small and each material will not be able to exhibit the rebound characteristics. The value of α is set as follows.

The test conditions in this oblique collision test are as follows.
V ₁ = 23.0~25.0m / s
α = 29-33 °
Ball rotation speed before collision = 0-25rpm
Ball air pressure = 0.81 kg / cm ²
The soccer ball used was Adidas 2006 World Cup Model Plus Team Geist.
Here, the reason why V ₁ is set in the above range is to correspond to the average speed of the foot before impact of professional and advanced amateur players.
In the diagonal impact test, thereby delivering a ball B toward the material sheet M stationary but, if consistent with the relative velocity of the ball and the foot of the collision velocity V ₁ is actually kick the ball B Such an oblique collision test is considered to be able to reproduce the actual collision phenomenon during kicking.

As the material sheet M, PU40A, which is a soft polyurethane having a hardness of 38A, and natural leather were prepared, and the oblique collision test was performed. When V ₁ = 24.1 m / s, the velocity component parallel to the material sheet M was 20.7 m / s and the velocity component perpendicular to the material sheet M was 12.4 m / s. At this time, the ball rotation speed after the ball collision was 911.5 rpm and 1045.5 rpm, respectively. On the other hand, when a general player actually kicks a soccer ball using a shoe having the same material in the upper non-rotating shoot area, the ball rotation speed after kicking is 103.1 rpm and 128.6 rpm, respectively. Met.

  If the same material is used, it is considered that the ball rotation number after the ball collision by the oblique collision test and the ball rotation number after the actual kick have a one-to-one correspondence. Therefore, as shown in FIG. 12, the horizontal axis represents the ball rotation speed (rpm) after the kick, and the vertical axis represents the ball rotation speed (rpm) after the ball collision in the oblique collision test. 1,911.5) and points (128.6, 1045.5) are plotted in the figure. Then, a straight line L ′ is obtained by connecting these two points in a straight line. This straight line L ′ is a graph showing the relationship between the ball rotation speed (rpm) after a general player actually kicks the ball and the ball rotation speed (rpm) after the ball collision in the oblique collision test.

  Here, when the ordinate corresponding to 110 rpm (abscissa), which is the upper limit value of the number of revolutions of the ball at the time of non-rotating chute, is obtained on the straight line L ′, it becomes 947.8 rpm. Again, if the upper two significant digits are adopted, the converted value of the ball rotation speed in the oblique collision test corresponding to the abscissa of 110 rpm is 950 rpm. Therefore, it was found that the upper limit value of the ball rotation number after the oblique collision test of the upper material that becomes a non-rotating chute after the actual kick is 950 rpm. It has also been found that when the ball rotation speed exceeds 950 rpm, it becomes a rotation kick (spin kick) such as a curve kick or an instep kick.

  Next, when another natural leather was prepared as the material sheet M and the oblique collision test was performed in the same manner, the ball rotation speed after the ball collision was 1044 rpm. On the other hand, when a first-class player kicks a non-rotating chute using shoes having this natural leather in the upper non-rotating chute region, the ball rotation speed after kicking was 100 rpm.

  Even in this case, if the same material is used, it is considered that the ball rotation number after the ball collision by the oblique collision test and the ball rotation number after the actual kick have a one-to-one correspondence. Therefore, a point (100, 1044) is plotted in FIG. 12, and a straight line L passing through this point is drawn. In the figure, 1044 rpm on the ordinate is a value very close to 1045.5 rpm on the ordinate, but for convenience of illustration, these intervals are enlarged.

Here, the reason why the slope of the straight line L is made larger than the slope of the straight line L ′ is as follows.
When the player actually tries to kick the non-rotating shot, it is preferable that the angle formed by the moving direction of the foot with respect to the normal established in the contact area of the foot on the ball is as small as possible. That is, the approach angle α in FIG. 11 is preferably as close to 90 degrees as possible. This is because the ball kicked toward the center of the ball is less likely to rotate. However, since the action of kicking the ball usually involves dorsiflexion of the foot, the absolute value of the angle formed by the movement direction of the foot with respect to the normal on the ball during kicking tends to increase. That is, the approach angle α in FIG. 11 tends to be small. On the other hand, a first-class soccer player can kick a ball while keeping his / her foot straight without bending his / her back, so the direction of movement of the foot during kicking is It is possible to reduce the absolute value of the angle formed with respect to the line. In this way, the lower the player, the smaller the approach angle, and the closer the approach angle α of the oblique collision test described above, and conversely, the better the player, the greater the entrance angle. The ball can be kicked at an angle larger than the angle α. In addition, even if the upper material has the same ball rotation speed after the ball collision in the oblique collision test, if the general player kicks the ball, the ball rotation speed after the kick increases, but the first-class player takes the ball. When kicking, the ball rotation speed after kicking tends to be low, and this tendency becomes more pronounced as the upper material has a higher ball rotation speed after ball collision in the oblique collision test.

  As can be seen from FIG. 12, when a general player kicks a ball with a shoe having an upper material having a ball rotation speed of 1045.5 rpm after the ball collision in the oblique collision test, the ball rotation speed after the kick is 128. .6 rpm (> 110 rpm), which does not result in a non-rotating shot, but when a general player kicks a ball with a shoe having an upper material with a ball rotation number of 950 rpm after a ball collision in an oblique collision test, The ball rotation speed after kicking becomes 110 rpm, and it becomes a non-rotating chute.

  Next, Table 1 shows the relationship between the hardness (A hardness) of the various material sheets M on the Asker A scale and the number of ball rotations after the ball collision by the oblique collision test using these material sheets M. In addition, the horizontal axis indicates the A hardness, the vertical axis indicates the ball rotation number, the data in Table 1 is plotted, and a linear function graph of the correlation between these data is shown in FIG.

In the graph equation in FIG. 13, the abscissa is x and the ordinate is y.
y = 5.359x + 697.2 (1)
It can be expressed as.

Here, if y = 950 is substituted into the equation (1),
x = 47.17≈47
Get.

  Therefore, it was found that the A hardness corresponding to the ball rotation speed of 950 rpm after the ball collision by the oblique collision test was 47 degrees. As a result of taking into account variations in measurement error, etc., it was decided to adopt 50 degrees as the upper limit value of the A hardness.

The present invention was made based on a variety of verification results described above, the full Tsu Toboru shoes upper structure, the upper member covering the medial side region of the foot instep top of the wearer, the upper member On the other hand, when an oblique collision test is performed in which a soccer ball is made to collide from an oblique direction, it is made of a material whose ball rotation speed immediately after reflection is 950 rpm or less.

In this case, as described above, the number of revolutions of 950 rpm or less after the ball collision in the oblique collision test corresponds to the number of revolutions of 110 rpm or less after the actual ball kick by a general player. Therefore, when an ordinary player kicks the ball in the upper instep region of the upper instep while wearing the upper structure shoes according to the present invention, a non-rotating shot is obtained. In this way, according to the present onset bright, even in a general player, you can control the spin characteristics of the ball after the kick, easily will be able to kick a non-rotating chute.

The present invention is characterized in that the upper instep side region of the upper instep is a region (first region) from the scaphoid bone of the wearer's foot to the inner wedge bone and the intermediate wedge bone.

  As described above, this is obtained by verifying the foot pressure measurement result when the player actually kicks the non-rotating shot.

The present invention is characterized in that the inner upper side region (first region) of the upper upper part of the foot is a region extending substantially in the shoe front-rear direction.

  This is because the foot pressure distribution region at the time of the non-rotating chute substantially extends in the front-rear direction of the shoe in FIG. 7A showing the result of the foot pressure measurement when the player actually kicks the non-rotating chute. Is focused on.

  In this specification, “substantially extending in the front-rear direction of the shoe” not only extends along the front-rear direction of the shoe (that is, the foot length direction), but also in an oblique direction that intersects the front-rear direction of the shoe (that is, the shoe). This is intended to include the case of extending in the front-rear direction and the shoe width direction).

In the present invention, the upper material of the inner upper side region (first region) of the upper instep has a plurality of protrusions extending substantially in the front-rear direction of the shoe, and each protrusion is the periphery thereof. Projecting upward from the upper region.

  In this case, when the ball is kicked in the inner upper side area of the upper instep, each ridge is elastically deformed, and as a result, the contact time with the ball becomes longer and the ball is rebounded in the second half of the rebound. It is considered that a shearing force that tends to suppress rotation tends to occur.

In the present invention, in the oblique collision test, a soccer ball having a rotational speed of 0 to 25 rpm from a direction of 29 to 33 degrees with respect to the surface of the plate is applied at a speed of 23.0 to 2 with the upper material attached to the plate. It is carried out by colliding with the upper material at 25.0 m / s.

  In this case, the soccer ball is caused to collide with a relatively shallow approach angle of 29 to 33 degrees with respect to the plate surface, as described above, because of the difference in the number of rotations of the soccer ball after the collision with various upper materials. On the other hand, if the approach angle is too small, the vertical component of the force at the time of collision becomes small and each upper material can no longer exhibit rebound characteristics. Is.

In the present invention, the upper material covering the inner upper side region (first region) of the upper instep is composed of a low-hardness material with low hardness, and the hardness of the low-hardness material is the A scale of Asker. It is 50 degrees or less. Further, the present invention is characterized in that the hardness of the low-hardness material is 30 to 50 degrees on the Asker A scale.

  This is because, as shown in the graph of FIG. 13, it was found that the lower the hardness of the upper material, the lower the ball rotation speed after the ball collision in the oblique collision test. Further, as shown in the graph of FIG. 13, the hardness of the upper material corresponding to the ball rotation speed of 950 rpm after the ball collision in the oblique collision test is about 47 degrees on the Asker A scale. The reason why the lower limit is set to 30 degrees is mainly due to consideration of manufacturing surface and durability.

The present invention is characterized in that the low hardness material is a soft polyurethane.

In the present invention, when the upper material covering the front side region (second region) in front of the inner side region is subjected to an oblique collision test in which a soccer ball is made to collide with the upper material from an oblique direction, reflection occurs. It is characterized in that it is made of a material whose ball rotation speed immediately after it becomes higher than 950 rpm.

  In this case, as described above, when the ball is kicked with an upper material whose ball rotation speed immediately after reflection in the oblique collision test exceeds 950 rpm, a rotating ball such as a curve kick or an instep kick (spin ball) Therefore, an upper material is disposed in the front area, which is the area where the ball of the rotating system should be kicked, so that the ball rotation speed immediately after reflection in the oblique collision test is higher than 950 rpm. It was.

  Also, in this case, when kicking a non-rotating shot, use the inner side area above the upper instep, and when kicking a spin kick such as a curve kick or an instep kick, Since the front area on the inner side only needs to be used, even a general player can easily separate the spin shoot and the non-rotation shoot.

The present invention is characterized in that the front region (second region) is a region from the first heel metatarsal to the first heel proximal phalanx of the wearer's foot.

  As described above, this is obtained by verifying the foot pressure measurement result when the player actually kicks a rotating ball such as a curve kick or an instep kick.

In the present invention, the upper material covering the front region in front of the inner side region is composed of a high hardness material that is relatively harder than the upper material covering the inner side region. Yes.

  This is the area where the front area in front of the inner area is for kicking a rotating ball such as a curve kick or an instep kick, and as shown in the graph of FIG. This is because the higher the hardness, the higher the ball rotation speed after the ball collision in the oblique collision test.

The present invention is characterized in that the high hardness material is a hard polyurethane having a hardness higher than that of the soft polyurethane.

The present invention is characterized in that the upper material covering the inner upper side region (first region) of the upper instep is made of a material having a low storage elastic modulus.

  FIG. 14 shows the difference in the storage elastic modulus E ′ depending on the material. In the figure, PU 80A represents polyurethane with A hardness (A scale of Asker) 80, the conventional product represents polyurethane with A hardness 64, and PU 40A represents polyurethane with A hardness 38. The horizontal axis indicates the frequency (Hz) of vibration applied to the material, and the vertical axis indicates the storage elastic modulus E ′ (Pa). In addition, the storage elastic modulus was measured based on the tensile vibration by the non-resonant forced vibration method specified in JIS K 7244-4. As can be seen from FIG. 14, it can be seen that the lower the hardness, the lower the storage elastic modulus.

In view of such a point, in the present invention, a material having a low storage elastic modulus is disposed in the inner upper region of the upper instep where the low hardness material is to be disposed. In addition, the low storage elastic modulus means that it is dynamically soft. Therefore, when an oblique collision test is performed using a material having a low storage elastic modulus, the contact time with the ball becomes longer during the collision with the material, and as a result, the material suppresses the rotation of the ball in the second half of the ball rebound. It is considered that a shearing force is applied in the intended direction.

In the present invention, the upper material covering the front region (second region) in front of the inner side region (first region) of the upper upper part of the instep is relatively more than the upper material covering the inner side region. It is characterized by being made of a material having a high storage elastic modulus.

From FIG. 14 described above, the higher the hardness is, the higher the storage elastic modulus is. Therefore, in the present invention , a higher hardness is required than the inner side region of the upper instep, the front side of the inner side region. A material having a high storage elastic modulus is arranged in the region.

In the present invention, the upper structure of the upper structure has a surface material disposed on the outside of the shoe and a backing material disposed on the inside of the shoe, and the surface material is along the inner side region of the upper instep. The upper material which is penetrated in the shape of a window hole and covers the inner side region of the upper part of the instep is provided on the backing material in the portion penetrated in the window hole shape.

  In this case, since the lower part of the upper material covering the inner upper side region of the upper instep is sinking into the interior of the surface material at the perforated portion of the window hole, the upper material is moved outward from the surface material. While suppressing excessive protrusion, a certain degree of thickness can be secured as the upper material, and peeling of the upper material can be prevented.

The present invention is characterized in that the upper material is provided so as to protrude upward from the surface material around the inner side region of the upper instep.

  In this case, the impact on the foot during the non-rotating chute can be reduced by adjusting the amount of protrusion of the upper material from the surface material.

This onset Ming, the upper structural soccer shoe, the upper member covering the medial side region of the foot instep top of the wearer (the first region), by non-resonant forced vibration method prescribed in JIS K 7244-4 It is made of a material whose storage elastic modulus is a value of 1.0 × 10 ⁷ (Pa) or less when a vibration of 35 Hz is applied in a test based on tensile vibration . Further, in the present invention, when the upper material covering the front region (second region) in front of the inner upper region of the upper instep is subjected to a vibration of 35 Hz in the above test, the storage elastic modulus is 1.0. It is made of a material having a value larger than × 10 ⁷ (Pa). Here, “35 Hz” is a frequency calculated from the natural frequency of the soccer ball.

  Now, as three types of polyurethanes with different hardness, conventional products (hardness 64A), PU40A (hardness 38A), PU80A (hardness 80A) are prepared, and the above-mentioned oblique collision test is performed using these, and the ball after the collision While measuring the rotation speed, the tensile vibration test based on above-mentioned JISK7244-4 was done, and the storage elastic modulus E '(pa) in frequency 35Hz was measured. These measurement results are shown in Table 2.

  Next, while taking E ′ (Pa) on the horizontal axis and the ball rotation speed (rpm) on the vertical axis, each measured value in Table 2 is plotted, and the correlation between these measured values is a linear function. FIG. 15 shows this graph.

The equation of the graph in FIG. 15 is such that the abscissa is x and the ordinate is y.
y = 2.221E-05x + 727.9
It can be expressed as. Here, if y = 950 is substituted,
x ≒ 1.0E + 07
Get.

From this, it was found that the storage elastic modulus E ′ corresponding to the ball rotation number 950 rpm after the ball collision by the oblique collision test is 1.0E + 07 (Pa), that is, 1.0 × 10 ⁷ (Pa). Therefore, the storage elastic modulus E ′ corresponding to the ball rotation speed of 950 rpm or less after the ball collision by the oblique collision test is 1.0 × 10 ⁷ (Pa) or less. One material that meets this criterion is PU40A from FIG. This also coincides with the fact that in FIG. 14, the material having a storage elastic modulus E ′ at a frequency of 35 Hz is 1.0 × 10 ⁷ (Pa) or less, that is, 1.0E + 07 (Pa) or less is PU40A.

Therefore, according to the present invention , even a general player can control the spin characteristics of the ball after kicking, and can easily kick a non-rotating shot. Further, according to the present invention , when kicking a non-rotating chute, the upper instep side area is used, and when kicking a spin kick such as a curve kick or an instep kick, the upper instep Since the front region in front of the inner shell side region may be used, even a general player can easily separate the spin shoot and the non-rotation shoot.

As described above, according to the upper structure of the present onset bright, the upper member covering the medial side region of the foot instep top of the wearer, oblique impact of colliding a soccer ball obliquely to the upper member When the test was performed, it was made of a material whose ball rotation speed immediately after reflection was 950 rpm or less, so the spin characteristics of the ball after kicking can be controlled, and even a general player can easily make a non-rotating shot. You will be able to kick.

Further, according to the upper structure of the present onset bright, the wearer's instep upper upper member covering the medial side region of the storage modulus is 1.0 × 10 ⁷ when given vibrations 35 Hz ( Pa) Since it is made of a material having a value equal to or less than the value, the spin characteristic of the ball after kicking can be controlled, and even a general player can easily kick a non-rotating shot.

It is an inner side side view of the soccer shoes (left foot) provided with the upper structure by one Example of this invention. It is an outer side side view of soccer shoes (Drawing 1). It is a top view of the front foot part of soccer shoes (Drawing 1). It is the IV-IV sectional view taken on the line of FIG. FIG. 6 is a side view of the inner side showing a non-rotating chute region, a curve kick region, and an instep kick region in association with a skeleton diagram of a left foot. It is a top view which shows a non-rotation chute area | region, a curve kick area | region, and an instep kick area | region corresponding to the skeleton figure of a left foot. (A) is the inner side side view of the left foot showing the foot pressure distribution during the non-rotating chute, and (b) is a plan view thereof. (A) is a side view of the inner foot side of the left foot showing a foot pressure distribution during a curve kick, and (b) is a plan view thereof. (A) is an inner side side view of the left foot showing a foot pressure distribution during an instep kick, and (b) is a plan view thereof. (A) is a top view which shows the ball | bowl before and after the impact in the case of a non-rotating chute, (b) is the side view. A table showing the data regarding the foot immediately before the ball impact, the data regarding the ball immediately after the ball impact, and the result of determining whether or not it is a non-rotating shot for each of the cases where the player made 11 non-rotating shoots. It is. It is a figure for demonstrating the outline | summary of an oblique collision test. It is a graph which shows the correlation with the ball rotation speed after the kick at the time of actually kicking a ball, and the ball rotation speed after the ball collision by an oblique collision test. It is a graph which shows the relationship between A hardness of various upper materials, and the rotation speed of the ball after the ball collision by an oblique collision test. It is the graph which showed the storage elastic modulus of various materials by the relationship with a frequency. It is a graph which shows the relationship between the storage elastic modulus of various materials, and the rotation speed of the ball after the ball collision by the diagonal collision test using the said various materials. It is a graph which shows the relationship between the contact time of a ball | bowl, and a storage elastic modulus, when an oblique collision test is performed using various raw materials. It is a figure for demonstrating the outline | summary of the simulation experiment which makes a ball collide with the panel which has a several protrusion part. 5 is a graph showing the relationship of Table 4 with the horizontal axis representing the design width of the panel top surface of each protrusion and the vertical axis representing the number of ball rotations. It is an inner side side view of the soccer shoes (left foot) provided with the upper structure by other examples of the present invention. FIG. 20 is a side view of the outer side of the soccer shoe (FIG. 19). FIG. 20 is a plan view of a front foot portion of a soccer shoe (FIG. 19). It is an enlarged view of the non-rotating chute panel part which comprises the non-rotating chute area | region of soccer shoes (FIG. 19). It is the XXIII-XXIII sectional view taken on the line of FIG.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
1 to 4 show a soccer shoe according to an embodiment of the present invention. As shown in FIGS. 1 to 3, the soccer shoe 1 includes a front foot side sole 2 disposed on a forefoot portion of the shoe and a rear foot portion of the shoe, and the front portion overlaps the front foot side sole 2. It is mainly composed of a foot side sole 3 and an upper (top) 4 fixed on the front foot side sole 2 and the rear foot side sole 3.

  A wind-up portion 2 a that rises upward along the outer surface of the upper 4 is formed on the rear portion of the forefoot side sole 2. The winding portion 2a is disposed so as to cover the overlap portion of the front foot side sole 2 and the rear foot side sole 3. A plurality of creats (spikes) 20 and 30 are provided on the lower surfaces of the forefoot side sole 2 and the rear foot side sole 3, respectively. Further, a heel counter portion 5 is mounted on the heel portion of the upper 4 in order to maintain the shape retaining property of the heel portion.

  The upper 4 has an inner side region 40 disposed on the inner side of the upper instep of the wearer's foot, and a front side region 45 disposed on the front side of the instep. As will be described later, the inner side area 40 is an area for kicking a non-rotating chute, and the front area 45 is an area for kicking a spin kick such as a curve kick and an instep kick. The inner side region 40 is a region that is formed in a substantially rectangular shape such as a substantially parallelogram shape that is substantially long in the front-rear direction of the shoe, and is substantially disposed in the front-rear direction of the shoe, and is relatively hard. Consists of low soft polyurethane. In other words, the soft polyurethane covers the inner side region 40 as a part of the upper material. For example, PU40A is preferable as the flexible polyurethane. A low hardness rubber may be used instead of the soft polyurethane.

  As shown in FIG. 4, which is a cross-sectional view taken along line IV-IV in FIG. 3, the inner side area 40 of the upper 4 includes a front material 4 </ b> A disposed outside the shoe 1 and a backing material disposed inside the shoe 1. 4B, and the surface material 4A has a window hole-like punching portion 4a that is punched in a window hole shape along the outer peripheral edge of the inner side region 40. The soft polyurethane in the inner side region 40 is provided on the interior material 4C disposed on the backing 4B in the window hole-like punching portion 4a.

Further, the flexible polyurethane of the medial side region 40 is substantially the plurality of grooves 41 in the shoe longitudinal direction extending intermittently, long hole-like penetrations formed between the grooves 41 adjacent to each other in the longitudinal direction shoe A plurality of rows (5 in this example) are arranged at intervals in the direction crossing the shoe front-rear direction. (See FIG. 1). Further, in these rows, the groove portions 41 and the through holes 42 are alternately arranged without being aligned in a direction crossing the shoe front-rear direction. Top (panel top surface) 40A of the soft polyurethane emissions is provided projecting from the table material 4A the surrounding upwards. In other words, the panel top surface 40A of the soft polyurethane in the inner side region 40 is composed of a plurality of protrusions that extend substantially in the front-rear direction of the shoe and protrude upward from the surrounding upper region. Yes.

  The design width which is the width of the panel top surface 40A of soft polyurethane in the inner side region 40 (that is, the length of the panel top surface 40A sandwiched between the groove portion 41 and the through hole 42 in FIG. 4) is preferably 2 mm or more. It is set (the reason will be described later). Further, by forming the plurality of groove portions 41 and the through holes 42 in the soft polyurethane, not only can the inner side region 40 be reduced in weight, but also the inner side region 40 can be easily conformed to the shape of the upper part of the instep of the wearer. Will be able to.

Front region 4 5, provided plurality in islands, relatively harder than the soft polyurethane of the medial side region 40 and a high rigid polyurethane 46. In other words, the hard polyurethane 46 substantially covers the front region 45 as part of the upper material. As the rigid polyurethane 46, for example, PU80A is preferable. High hardness rubber may be used instead of hard polyurethane.

The front region 45, and the table member 4A of the upper 4 along the outer peripheral edge portion is formed partially 4a 'hollow plurality of window hole shape which is hollowed out in a window hole-shaped region of the rigid polyurethane emissions, Each of these rigid polyurethanes 46 is provided on the backing 4B of the upper 4 in these window-hole-like penetration portions 4a '. Moreover, the upper surface of each hard polyurethane 46 is provided so as to protrude from the surrounding surface material 4A, as in the case of the soft polyurethane in the inner side region 40 (not shown).

As shown in the skeleton diagram of the foot shown in FIG. 5 and FIG. 6, the inner shell side region 40 is a region (non-rotating shoot region) extending from the scaphoid bone NB of the foot to the inner wedge bone MC and the intermediate wedge bone IC. ) This is a region that suffers NR. Similarly, as shown in FIGS. 5 and 6, the anterior region 45 is superimposed on the _first phalanx phalange DP ₁ from the bottom of the foot to the first phalanx phalange PP ₁ and The first metatarsal bone ME _{1 includes} a region (instep kick region) IK and an instep kick region IK, and further includes a region covering the first metatarsal ME ₁ immediately before the bone bottom ( Curve kick area) CK. In FIGS. 5 and 6, LC indicates the outer wedge bone, CA indicates the radius, and TA indicates the talus.

  The reason why the non-rotating shoot area NR, the curve kick area CK and the instep kick area IK were determined in such positions was that 10 leading players actually took the non-rotating shoot, curve kick and instep kick. Based on the foot pressure distribution result of the foot.

  7 shows the foot pressure distribution of the non-rotating chute, FIG. 8 shows the foot pressure distribution of the curve kick, and FIG. 9 shows the foot pressure distribution of the instep kick. Each of these shows average value data of the measurement results. Each figure (a) shows the foot pressure distribution on the instep side of the left foot, and each figure (b) shows the foot pressure distribution on the instep part of the left foot. Show. In this foot pressure measurement, a sensor is attached along the inner side of the foot surface and along the first to fifth toes, and each player is in a state of wearing a sock. We measured how much pressure was applied to which position of the foot during kicking.

As shown in FIG. 7, it was found that the non-rotating chute kicks mainly in the inner side area of the upper instep of the foot. As can be seen by overlapping this inner side region with the skeleton diagram of the left foot shown in FIGS. 5 and 6, the non-rotating chute region NR, which is a relatively high foot pressure region when kicking the non-rotating chute, This is a region covering the scaphoid bone NB of the foot, the medial wedge bone MC, and the intermediate wedge bone IC. As can be seen from FIGS. 8, 5, and 6, the curve kick region CK, which is a region where the foot pressure is relatively high at the time of the curve kick, is the first phalanx of the foot DP ₁ from the bone bottom to the first heel proximal Bone PP ₁ and the first heel metatarsal bone ME ₁ are areas covered up to the portion immediately before the bone bottom. Similarly, as can be seen from FIGS. 9, 5, and 6, the instep kick region IK, which is a region where the foot pressure is relatively high at the time of the instep kick, is from the _first phalanx DP ₁ of the foot. This is a region covering up to the central portion of the first heel proximal phalanx PP ₁ and the first heel metatarsal bone ME ₁ . The curve kick area CK extends to the rear side of the inner side of the instep kick IK.

  Moreover, a relatively low hardness soft polyurethane is used as the upper material of the non-rotating chute region NR, and a relatively high hardness hard polyurethane 46 is used as the upper material of the curve kick region CK and the instep kick region IK. This is because attention was paid to the fact that the number of ball rotations after kicking differs depending on the hardness.

  First, in order to verify under what conditions the non-rotating shoot occurs, the inventors of the present application actually asked a leading soccer player to kick the non-rotating shoot, and the kick point where the ball was placed Then, the observer observed the trajectory of the ball after kicking visually at both the target point 50 m away from the target. And only the thing which both observers judged as a non-rotating chute was determined to be a non-rotating chute. In addition, the determination of whether or not it is a non-rotating chute is based on a ball trajectory where the kicked ball does not bend in one direction and sways while shaking, The case where an unpredictable trajectory was drawn by making a motion that fluctuated during flight was defined as “no rotation”.

  As described above, FIG. 10A shows the determination result as to whether or not there is a non-rotating shoot for each of the cases where the player has tried the non-rotating shoot 11 times. From this judgment result, the maximum number of rotations of the ball immediately after the ball impact at which a non-rotating chute is obtained is 111 rpm, but considering the measurement error and the variation of the observer, the upper two significant digits of the measured value are I decided to adopt it. Therefore, it is determined that the ball rotation speed at which a non-rotating chute is obtained is 110 rpm or less.

  Note that the various data in FIG. 10A and FIGS. 10 (a) and 10 (b) related to these data have already been described in the above section [Means for Solving the Problems]. The detailed description of is omitted.

  Next, the inventors of the present application described the ball rotation number after the ball collision in the oblique collision test having a high correlation with the phenomenon that the player kicks the ball, and the upper limit value of the ball rotation number when actually performing the non-rotating shot. The corresponding relationship with 110 rpm was verified.

  In the oblique collision test, as shown in FIG. 11, a soccer ball fired from a soccer ball launcher (not shown) in a state in which a material sheet M as an upper material is stuck to a human body hardness board HB and fixed to an iron board IB. This is performed by causing the ball B to collide with the material sheet M. Here, the human body hardness plate is a plate made of vinyl chloride having a hardness corresponding to the human body and having a thickness of 10 mm, and has a hardness of 60 degrees on the A scale of Asker. The reason why the human body hardness plate HB is inserted between the material sheet M and the iron plate IB is that the human body receives an impact force acting on the upper during an actual kick.

In FIG. 11, the angle α is an approach angle formed by the surface of the material sheet M when the soccer ball B launched from the soccer ball launching device collides with the material sheet M, and the angle β is from the material sheet M after the collision. The rebound angle that the rebounding soccer ball B makes with the surface of the material sheet M, and V ₁ and V ₂ are the collision speed and rebound speed of the ball B, respectively. The soccer ball B is made to collide diagonally with an acute angle α with respect to the surface of the material sheet M because the smaller the incident angle, the more easily the ball after the collision is likely to rotate. On the other hand, if the approach angle is too small, the vertical component of the force at the time of collision will be small and each material will not be able to exhibit the rebound characteristics. Then, the value of α is set as follows.

The test conditions in this oblique collision test are as follows.
V ₁ = 23.0~25.0m / s
α = 29-33.0 °
Ball rotation speed before collision = 0-25rpm
Ball air pressure = 0.81 kg / cm ²
The soccer ball used was Adidas 2006 World Cup Model Plus Team Geist.
Here, the reason why V ₁ is set in the above range is that it corresponds to the average speed of the foot before the impact of professional and advanced amateur players.
In the diagonal impact test, thereby delivering a ball B toward the material sheet M stationary but, if consistent with the relative velocity of the ball and the foot of the collision velocity V ₁ is actually kick the ball B Such an oblique collision test is considered to be able to reproduce the actual collision phenomenon during kicking.

As the material sheet M, PU40A, which is a soft polyurethane having a hardness of 38A, and natural leather were prepared, and the oblique collision test was performed. When V ₁ = 24.1 m / s, the velocity component parallel to the material sheet M was 20.7 m / s and the velocity component perpendicular to the material sheet M was 12.4 m / s. At this time, the ball rotation speed after the ball collision was 911.5 rpm and 1045.5 rpm, respectively. On the other hand, when a general player actually kicks a soccer ball using a shoe having the same material in the upper non-rotating shoot area, the ball rotation speed after kicking is 103.1 rpm and 128.6 rpm, respectively. Met.

  If the same material is used, it is considered that the ball rotation number after the ball collision by the oblique collision test and the ball rotation number after the actual kick have a one-to-one correspondence. Therefore, as shown in FIG. 12, the horizontal axis represents the ball rotation number (rpm) after kicking, and the vertical axis represents the ball rotation number (rpm) after the ball collision. And points (128.6, 1045.5) are plotted in the figure. Then, a straight line L ′ is obtained by connecting these two points in a straight line. This straight line L ′ is a graph showing the relationship between the ball rotation speed (rpm) after a general player actually kicks the ball and the ball rotation speed (rpm) after the ball collision in the oblique collision test.

  Here, when the ordinate corresponding to 110 rpm (abscissa), which is the upper limit value of the number of revolutions of the ball at the time of non-rotating chute, is obtained on the straight line L ′, it becomes 947.8 rpm. Again, if the upper two significant digits are adopted, the converted value of the ball rotation speed in the oblique collision test corresponding to the abscissa of 110 rpm is 950 rpm. Therefore, it was found that the upper limit value of the ball rotation number after the oblique collision test of the upper material that becomes a non-rotating chute after the actual kick is 950 rpm.

  From this, as an upper material covering the inner instep side region 40 of the upper part of the instep of the wearer, particularly the region (non-rotating chute region) NR from the scaphoid bone NB of the foot to the inner wedge bone MC and the intermediate wedge bone IC When an oblique collision test is performed in which a soccer ball collides against the upper material from an oblique direction, it is necessary that the number of rotations of the ball immediately after reflection is 950 rpm or less.

  By wearing shoes having such an upper material in the non-rotating shoot area NR and kicking the ball in the non-rotating shoot area NR, even a general player can control the spin characteristics of the ball after kicking, so that You can kick the rotating chute.

Further, FIG. 12 shows that when the ball is kicked with an upper material whose ball rotation speed after the ball collision exceeds 950 rpm in the oblique collision test, a rotating ball such as a curve kick or an instep kick is obtained. From this, the front region 45 of the upper instep side region 40 of the upper instep, particularly from the first phalanx phalanx DP ₁ bone bottom to the first heel proximal phalanx PP ₁ and the first heel metatarsal bone ME ₁ . As the upper material covering the region (spin kick region), the ball rotation speed immediately after reflection is higher than 950 rpm when an oblique collision test is performed in which a soccer ball collides against the upper material from an oblique direction. It is necessary.

  In FIG. 12, a straight line L is a graph showing the relationship between the ball rotation speed (rpm) after a first-class player actually kicks the ball and the ball rotation speed (rpm) after the ball collision in the oblique collision test. It is. Points (100, 1044) on the graph indicate ball rotation after kicking when a first-class player kicks a non-rotating shoot using shoes having natural leather prepared as a material sheet M in the non-rotating shoot area of the upper. And the correspondence with the number of ball rotations after a ball collision by an oblique collision test using the natural leather.

  Here, the inclination of the straight line L is made larger than the inclination of the straight line L ′, even if the upper player has the same number of ball rotations after the ball collision in the oblique collision test. However, if a first-class player kicks the ball, the ball speed after kicking tends to decrease, and this tendency is higher for upper materials with higher ball speed after a ball collision in an oblique collision test. This is because it becomes prominent.

  Further, as can be seen from FIG. 12, when a general player kicks a ball with a shoe having an upper material with a ball rotation speed of 1045.5 rpm after the ball collision in the oblique collision test, the ball rotation speed after the kick is 128.6 rpm (> 110 rpm), which does not result in a non-rotating shot, but when a general player kicks a ball with a shoe having an upper material with a ball rotation number of 950 rpm after a ball collision in an oblique collision test The ball rotation speed after kicking becomes 110 rpm, which is a non-rotating chute.

  Next, Table 1 shows the relationship between the hardness (A hardness) of the various material sheets M on the Asker A scale and the ball rotation speed after the ball collision by the oblique collision test using these material sheets M. ing. In addition, the horizontal axis indicates the A hardness, the vertical axis indicates the ball rotation number, the data in Table 1 is plotted, and a linear function graph of the correlation between these data is shown in FIG.

In the graph equation in FIG. 13, the abscissa is x and the ordinate is y.
y = 5.359x + 697.2
It can be expressed as. Here, if y = 950 is substituted,
x = 47.17≈47
Get.

  Accordingly, it was found that the A hardness corresponding to the ball rotation speed 950 rpm after the ball collision by the oblique collision test is 47 degrees. As a result of taking into account variations in measurement error, etc., it was decided to adopt 50 degrees as the upper limit value of the A hardness. In consideration of wear resistance as the upper material, the lower limit of the A hardness is preferably 30 degrees. Therefore, it is determined that the hardness of the upper material used for the non-rotating chute region NR of the upper 4 is preferably 30 to 50 A on the Asker A scale.

  From the graph of FIG. 13, the lower the hardness, the lower the ball rotation speed after the ball collision by the oblique collision test, and the higher the hardness, the higher the ball rotation speed after the ball collision by the oblique collision test. I understand.

  The reason why such an event occurs is considered to be that when the hardness is low, the contact time with the ball becomes longer during an oblique collision, and the force to reduce the spin of the ball acts at that time.

Therefore, the upper 4 employs a soft polyurethane (preferably PU40A: hardness 38A ) having a low hardness in the non-rotating chute region NR that requires a low number of ball rotations after kicking, and a certain amount of balls after kicking. Relatively hard polyurethane (preferably PU80A: hardness 80A) 46 is employed in the instep kick region IR and the curve kick region CK, which require a rotational speed.

In addition, the non-rotating chute area NR, as well as provided a low storage modulus material, the instep kick region I K and curve kick region CK, to provided having a relatively high storage modulus material It may be. The reason is as follows.

  FIG. 14 shows the difference in storage elastic modulus E ′ depending on the material. In the figure, PU80A is polyurethane with A hardness (A scale of Asker) 80, and the conventional product is polyurethane with A hardness 64, PU40A. Indicates polyurethanes with an A hardness of 38 respectively. The horizontal axis indicates the frequency (Hz) of vibration applied to the material, and the vertical axis indicates the storage elastic modulus E ′ (Pa). In addition, the storage elastic modulus was measured based on the tensile vibration by the non-resonant forced vibration method specified in JIS K 7244-4.

  As can be seen from FIG. 14, the lower the hardness, the lower the storage elastic modulus. In view of such a point, a material having a low storage elastic modulus is arranged in the non-rotating chute region NR that is an inner side region of the upper instep where the low-hardness material should be arranged, and the inner side of the upper instep A material having a high storage elastic modulus is arranged in the front region of the inner side region, which requires higher hardness than the region.

Here, the relationship between the storage elastic modulus and the ball rotation speed will be verified.
Currently, three types of polyureters with different hardnesses are available: conventional product (hardness 64A), PU40A (hardness 38A), and PU80A (hardness 80A). While measuring the rotation speed, the tensile vibration test based on above-mentioned JISK7244-4 was done, and the storage elastic modulus E '(pa) in frequency 35Hz was measured. These measurement results are as shown in Table 2. Here, “35 Hz” is a frequency calculated from the natural frequency of the soccer ball.

  Next, while taking E ′ (Pa) on the horizontal axis and the ball rotation speed (rpm) on the vertical axis, each measured value in Table 2 is plotted, and the correlation between these measured values is a linear function. FIG. 15 shows this graph.

The equation of the graph in FIG. 15 is such that the abscissa is x and the ordinate is y.
y = 2.221E-05x + 727.9
It can be expressed as. Here, if y = 950 is substituted,
x ≒ 1.0E + 07
Get.

From this, it was found that the storage elastic modulus E ′ corresponding to the ball rotation number 950 rpm after the ball collision by the oblique collision test is 1.0E + 07 (Pa), that is, 1.0 × 10 ⁷ (Pa). Therefore, the storage elastic modulus E ′ corresponding to the ball rotation speed of 950 rpm or less after the ball collision by the oblique collision test is 1.0 × 10 ⁷ (Pa) or less. One material that meets this criterion is PU40A from FIG. This also coincides with the fact that in FIG. 14, the material having a storage elastic modulus E ′ at a frequency of 35 Hz is 1.0 × 10 ⁷ (Pa) or less, that is, 1.0E + 07 (Pa) or less is PU40A.

  In addition, the low storage elastic modulus means that it is dynamically soft. Therefore, when an oblique collision test is performed using a material having a low storage elastic modulus, the contact time with the ball becomes longer during the collision with the material, and as a result, the material suppresses the rotation of the ball in the second half of the ball rebound. It is presumed that a shearing force is applied in the intended direction. On the other hand, in the case of a material with a high storage modulus, the contact time with the ball is shortened in the case of an oblique collision with the material, and as a result, the action of a shear force that suppresses the rotation of the ball in the second half of the ball rebound It is considered that the number of rotations of the ball after the collision does not decrease.

From this point of view, in the present embodiment, the storage elastic modulus of the upper instep side region 40 of the upper instep becomes a value of 1.0 × 10 ⁷ (Pa) or less when a vibration of 35 Hz is applied, and The storage elastic modulus of the front region 45 in front of the inner side region 40 is set to a value larger than 1.0 × 10 ⁷ (Pa) when a vibration of 35 Hz is applied.

Next, the relationship between the storage elastic modulus and the ball contact time was verified.
Measures the contact time of the ball in contact with each material sheet (that is, the time from the start of contact until immediately before leaving) when the oblique collision test is performed using the above-mentioned three types of polyurethane (conventional product, PU40A, PU80A). did. The test was performed 8 times for each material sheet, and the average value of the measured contact times was determined. Table 3 shows the measurement results.

  Table 3 shows the relative contact time values of PU40A and PU80A when the contact time of the conventional product is 100. Further, the storage elastic modulus E ′ of each material is also described in the same manner.

  Next, taking the contact time (%) on the horizontal axis and E ′ (Pa) on the vertical axis, each measured value in Table 3 is plotted, and the correlation between these measured values is expressed by a linear function. A graph is shown in FIG. From the figure, it was verified that the lower the storage modulus, the shorter the contact time of the ball.

  Next, the design width which is the width of the panel top surface 40A of soft polyurethane in the inner side region 40 (that is, the length of the panel top surface 40A sandwiched between the slit 41 and the through hole 42 in FIG. 4) is set to 2 mm or more. The reason for setting is as follows.

  Now, as shown in FIG. 17, a panel P made of polyurethane PU40A in which a plurality of protrusions having a design width t (mm) are arranged at intervals of 1.0 (mm) and a ball B having a diameter of 220 (mm). A model was created, a simulation experiment was performed under the same conditions as when the ball B actually collided with the panel P, and the ball rotation speed after the collision was obtained by FEM analysis.

  In this simulation experiment, the design width t was changed from 1.0 (mm) to 5.0 (mm) in 1 (mm) increments, and the ball rotation speed after collision was calculated for each. The results are shown in Table 4. The table also shows the relative values of the ball rotation speeds in other design widths when the value of the ball rotation speed when the design width is 1.0 (mm) is 100.

  FIG. 18 shows a graph of the results in Table 4 with the design width t (mm) on the horizontal axis and the number of ball rotations (%) on the vertical axis. As can be seen from the figure, when the design width is 1 (mm) and the design width is 2 (mm) or more, the value of the ball rotation speed is greatly different. The number of revolutions has decreased significantly. For this reason, the width of the panel top surface 40A of the soft polyurethane in the inner side region 40 of the present embodiment is set to 2 (mm) or more.

  In the above-described simulation experiment, the total thickness D of the used panel P is 1 to 2 (mm). However, regarding the thickness of the base Pb, even if this is changed, each design width shown in FIG. Although the value of each ball rotation number increased or decreased, it was confirmed that the correlation (that is, the magnitude relationship) between the ball rotation numbers did not change.

  Thus, according to this example, when the upper material covering the inner upper side region of the wearer's upper instep was subjected to an oblique collision test in which a soccer ball was made to collide with the upper material from an oblique direction. Since it is made of a material whose ball rotation speed immediately after reflection is 950 rpm or less, the spin characteristics of the ball after kicking can be controlled, and a general player can easily kick a non-rotating shot. Become.

Moreover, according to the present Example, when the upper material which covers the inner side area | region of a wearer's upper instep is given a vibration of 35 Hz, a storage elastic modulus is 1.0 * 10 < ⁷ > (Pa) or less. Since it is made of a material that has a value, the spin characteristics of the ball after kicking can be controlled, and even a general player can easily kick a non-rotating shot.

Moreover, according to the present example, when the upper member covering the inner upper side region of the upper instep of the wearer was subjected to an oblique collision test in which a soccer ball was made to collide with the upper material from an oblique direction, Since the ball rotation speed immediately after the reflection is made of a material higher than 950 rpm, or the upper material covering the front side region of the inner upper side region of the upper foot of the wearer is given a vibration of 35 Hz. The material is made of a material whose storage elastic modulus is greater than 1.0 × 10 ⁷ (Pa), so that even general players can spin shoots such as curve kicks and instep kicks and non-rotating shoots. Can be easily kicked apart.

  Furthermore, according to the present embodiment, the lower surface 41a of the soft polyurethane 41 serving as the upper material covering the upper instep side region 40 of the upper instep sinks into the inside of the surface material 4A at the window hole-like punching portion 4a. (Refer to FIG. 4), while preventing the upper material from excessively projecting outward from the surface material 4A, it is possible to secure a certain thickness as the upper material and prevent the upper material from peeling off. it can. Further, since the upper material is provided so as to project from the surface material 4A around the inner side region 40 at the upper part of the instep, by adjusting the amount of protrusion of the upper material from the surface material 4A, there is no rotation. Can reduce the impact on the foot during shooting.

  Similarly, the lower surface of the rigid polyurethane 46 serving as the upper material covering the front region 45 of the upper instep side region 40 of the upper instep sinks into the inside of the surface material 4A at the window hole-like punched portion 4a ′ of the surface material 4A. Therefore, it is possible to secure a certain thickness as the upper material while preventing the upper material from excessively projecting outward from the surface material 4A, and to prevent the upper material from peeling off. Moreover, by adjusting the amount of protrusion of the upper material from the surface material 4A by protruding the upper material from the surrounding surface material 4A, the upper material can be used for a curve kick or an instep kick. Shock can be mitigated.

  Next, FIGS. 19 to 23 show a soccer shoe according to another embodiment of the present invention. In these drawings, the same reference numerals as those in FIGS. 1 to 4 in the above-described embodiment denote the same or corresponding parts.

  As shown in FIGS. 19 to 21, the soccer shoe 1 ′ includes an inner side region 40 ′ disposed on the inner side of the upper upper part of the upper 4, and a front region 45 disposed in front thereof. Have. The inner side area 40 ′ is an area for kicking the non-rotating chute, as in the inner side area 40 of the above-described embodiment, and extends substantially in the front-rear direction of the shoe. It is an area. The inner side region 40 ′ extends to the region from the scaphoid bone NB of the wearer's foot to the inner wedge bone MC and the intermediate wedge bone IC, similarly to the inner side region 40 of the above-described embodiment ( (Refer to the skeleton diagrams of FIGS. 5 and 6).

The inner side region 40 ′ is made of a material that has a ball rotation speed immediately after reflection of 950 (rpm) or less when the above-described oblique collision test is performed. Alternatively, the inner side region 40 ′ is made of a material whose storage elastic modulus is a value of 1.0 × 10 ⁷ (Pa) or less when a vibration of 35 Hz is applied. As such a material, for example, a soft polyurethane having a hardness of 50 degrees or less, preferably 30 to 50 degrees on the A-scale of Asker is used.

  The soft polyurethane in the inner side region 40 ′ was formed by penetrating the upper surface material 4A in a window hole shape as shown in FIG. 22 which is an enlarged view of the panel parts and FIG. 23 which is a cross-section of the XXIII-XXIII line. In the punched-in portion 4a, it is provided on the interior material 4C disposed on the upper backing material 4B. The soft polyurethane in the inner side region 40 ′ is formed from a plurality of elongated through holes 42 ′ that extend intermittently along the fan shape of the inner side region 40 ′ and from the center of the inner side region 40 ′. And a groove 41 'extending in the cross direction.

  An upper surface (panel top surface) 40A 'of the soft polyurethane in the inner side region 40' is provided so as to protrude upward from the surrounding surface material 4A. In other words, the panel top surface 40A of the soft polyurethane in the inner side region 40 ′ has a plurality of protrusions extending substantially in the front-rear direction of the shoe and protruding upward from the surrounding upper region. ing.

The width of the panel top surface 40A ′ of soft polyurethane in the inner side region 40 ′ (that is, sandwiched between adjacent through holes 42 ′ in FIG. 23, or between the through hole 42 ′ and the groove 41 ′) design width is the length of the panel top surface 40A '), similar to the embodiment, which is preferably set to at least 2 mm. Further, by forming a plurality of groove portions 41 ′ and through-holes 42 ′ in soft polyurethane, not only can the inner side region 40 ′ be reduced in weight, but the inner side region 40 ′ can be formed in the shape of the upper part of the instep of the wearer. It will be possible to easily follow.

On the other hand, the front side region 45 in front of the upper instep side region 40 ′ is a region for kicking a spin kick such as a curve kick or an instep kick, and, similar to the above embodiment, the wearer's foot This is a region from the first heel metatarsal ME ₁ to the first heel proximal phalanx PP ₁ .

The front region 45 is made of a material such that the ball rotation speed immediately after reflection is higher than 950 (rpm) when the oblique collision test described above is performed. Alternatively, the front region 45 is made of a material whose storage elastic modulus is greater than 1.0 × 10 ⁷ (Pa) when a vibration of 35 Hz is applied. As such a material, for example, hard polyurethane having a hardness of 50 degrees or more on the Asker A scale is used.

  As shown in FIGS. 19 to 21, the front region 45 is composed of a plurality of hard polyurethanes 46 arranged in an island shape. Each of the hard polyurethanes 46 is provided in a plurality of window-hole-like through-hole portions 4a 'penetrating through the upper surface material, and the upper surface of each hard polyurethane 46 protrudes from the surrounding surface material.

  In this case as well, the spin characteristics of the ball after kicking can be controlled as in the previous embodiment, and not only a general player can easily kick a non-rotating shot, but also a general player can perform a curve kick. It is possible to easily separate a spin shoot such as an instep kick and a non-rotating shoot.

  As described above, the present invention is useful for football shoes, and is particularly suitable for the upper structure of soccer shoes.

1: Soccer shoes

4: Upper 4A: Front material 4B: Back material 4a, 4a ': Penetration part 40, 40': Inner side area 40A, 40A ': Panel top surface 45: Front side area 46: Rigid polyurethane (upper material) )

MC: medial wedge bone IC: intermediate wedge bone PP ₁ : first heel proximal phalanx ME ₁ : first metatarsal bone
NB: Scaphoid

JP-A-8-332101 (see FIGS. 1, 4, 7, etc.) Japanese Patent Laid-Open No. 9-28412 (see FIGS. 1 and 4 to 6). Japanese translations of PCT publication No. 2004-520113 (refer FIG. 2, FIG. 7). Japanese translation of PCT publication No. 10-501725 (refer FIG. 1, FIG. 2). Japanese translation of PCT publication No. 2007-509655 (see paragraphs [0001] and [0010] of the specification) Japanese translation of PCT publication No. 2001-523499 (refer to FIGS. 1, 3, and 4 to 10).

Claims (10)

In the upper structure for football shoes,
The upper material covering the first region from the scaphoid to the inner wedge bone and the intermediate wedge bone in the inner instep side region of the upper instep of the wearer is a non-resonant forced vibration specified in JIS K 7244-4 It is made of a material whose storage elastic modulus is a value of 1.0 × 10 ⁷ (Pa) or less when a vibration of 35 Hz is applied in a test based on the tensile vibration by the method ,
The upper structure for football shoes characterized by the above. In claim 1,
The upper material covering the second region from the first heel metatarsal to the first heel proximal phalanx of the wearer's foot in the front region in front of the first region gives a vibration of 35 Hz in the test. The storage elastic modulus is made of a material having a value larger than 1.0 × 10 ⁷ (Pa),
The upper structure for football shoes characterized by the above. In the upper structure for football shoes,
The upper material covering the first region from the scaphoid bone to the inner wedge bone and the intermediate wedge bone in the upper instep side region of the wearer's upper instep is low in hardness of 50 degrees or less on the Asker A scale. An upper material that is made of a low-hardness material and covers a second region from the first heel metatarsal to the first heel proximal phalanx of the wearer's foot in the front region in front of the first region. The upper material covering the first region is made of a high hardness material that is relatively harder than the upper material.
The upper structure for football shoes characterized by the above. In claim 3,
The hardness of the low hardness material is 30-50 degrees on Asker's A scale,
The upper structure for football shoes characterized by the above. In claim 3,
The low hardness material is soft polyurethane;
The upper structure for football shoes characterized by the above. In claim 3,
The high hardness material is rigid polyurethane;
The upper structure for football shoes characterized by the above. In claim 1 or 3,
The first region is a region extending substantially in the shoe front-rear direction;
The upper structure for football shoes characterized by the above. In claim 1 or 3,
The upper material of the first region has a plurality of protrusions extending substantially in the shoe front-rear direction, and each protrusion protrudes upward from the surrounding upper region.
The upper structure for football shoes characterized by the above. In claim 1 or 3,
The upper of the upper structure has a surface material disposed on the outside of the shoe and a backing material disposed on the inside of the shoe, and the surface material penetrates in a window hole shape along the first region. The upper material covering the first region is provided on the backing material in the perforated portion of the window hole,
The upper structure for football shoes characterized by the above. In claim 9,
The upper material is provided so as to protrude upward from the surface material around the first region.
The upper structure for football shoes characterized by the above.