JP5271220B2 - Golf shoes - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pair of golf shoes achieving excellent nonslip performance related to improvement to outsoles of the golf shoes. <P>SOLUTION: The pivot foot shoe 10 of the golf shoes includes the outsole 22. The outsole 22 has a number of projections 26. The outsole 22 satisfies the following expresion: Pi&gt;Pc&ge;Po. In the expression, Pi is the share of a grounding surface of an inside zone Zi, Pc is the share of the grounding surface of a center zone Zc, and Po is the share of the grounding surface of an outside zone Zo. The ratio (Pi/Pc) is 1.2-4.0. The ratio (Pc/Po) is 1.0-3.0. The kicking foot shoe has an inverted form of the pivot foot shoe 10. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a golf shoe. Specifically, the present invention relates to an improvement in the outsole of a golf shoe.

  When a golfer hits a golf ball, the golf ball is addressed so that the line connecting the left and right toes is substantially parallel to the hitting direction. In the address of a right-handed golfer, the left foot is located on the front side in the batting direction and the right foot is located on the rear side in the batting direction. At the address, the golf club head is located near the golf ball. From this state, the golfer starts taking back and swings the head backward and then upwards. The position where the head is most swung up is the top position. A downswing is started from the top position, the head is swung down, and the head collides with the golf ball (impact). After the impact, the golfer swings the golf club forward and then upwards (follow-through), and finishes.

  From the top position to the finish, a great force is applied to both legs of the golfer. This force can cause the golf shoe to slip with the ground. When slip occurs, the swing form is disturbed and a miss shot occurs. In particular, slip is likely to occur from the top position to the impact.

  There are golf shoes having spike pins made of metal or ceramic on the bottom surface. Spike pins prevent slipping. However, in this golf shoe, spike pins damage the lawn on the green, the floor of the clubhouse, the road surface of the walking path provided in the golf course, and the like. Many golf courses prohibit the use of golf shoes with spike pins. Golf shoes with spike pins have a feeling of being pushed up from the bottom, and are not comfortable for golfers. Golf shoes with spike pins have not been used much in recent years.

  Golf shoes in which protrusions made of rubber or synthetic resin are provided on the bottom instead of the spike pins are widely used. In this golf shoe, the lawn or the like is rarely damaged. This golf shoe is excellent in comfort. However, this golf shoe has insufficient anti-slip performance as compared with a golf shoe having spike pins.

  A right-handed golfer makes a body turn from the top position to the finish with the left foot as the axis. At the same time, the golfer kicks the ground with his right foot and transmits the force to the golf ball. Right-handed golfers use the left foot as the axle and the right foot as the kick. For left-handed golfers, use the right foot as the axle and the left foot as the kick. Japanese Patent Application Laid-Open No. 2001-299406 discloses a golf shoe in which the direction of force in a golf swing is considered.

JP 2001-299406 A

  In the golf shoe disclosed in Japanese Patent Laid-Open No. 2001-299406, the pattern of the protrusion is determined in consideration of the horizontal force. In this shoe, the vertical force is not taken into account. The anti-slip performance of this shoe is not sufficient.

  An object of the present invention is to provide a golf shoe excellent in anti-slip performance.

A golf shoe according to the present invention includes an outsole. The outsole has a base and a number of protrusions that protrude from the base and include a ground plane. This outsole satisfies the following mathematical formula.
Pi> Pc ≧ Po
In this equation, Pi is the occupancy ratio of the ground plane in the inside zone, Pc is the occupancy ratio of the ground plane in the center zone, and Po is the occupancy ratio of the ground plane in the outside zone. In the present invention, the length of the longest line that can be drawn on the outline of the bottom surface of the outsole is the length L. A straight line passing through the inside end of the contour and parallel to the longest line is an inside reference line. A straight line passing through the outside end of the contour and parallel to the longest line is an outside reference line. The distance between the inside reference line and the outside reference line is a width W. A straight line having a distance from the inside reference line of 0.20 W and parallel to the longest line is the first dividing line. A straight line having a distance from the inside reference line of 0.40 W and parallel to the longest line is the second partition line. A straight line parallel to the longest line with a distance from the inside reference line of 0.50 W is a third division line. The straight line parallel to the longest line with a distance from the inside reference line of 0.70 W is the fourth division line. A straight line that passes through a point on the longest line whose distance from the toe side end of the longest line is 0.10 L and is orthogonal to the longest line is the fifth division line. A straight line passing through a point on the longest line having a distance from the toe side end of the longest line of 0.40 L and orthogonal to the longest line is a sixth division line. The inside zone is surrounded by an inside reference line, a second lane line, a fifth lane line, and a sixth lane line. The center zone is surrounded by a first lane line, a fourth lane line, a fifth lane line, and a sixth lane line. The outside zone is surrounded by a third lane line, an outside reference line, a fifth lane line, and a sixth lane line.

  Preferably, the ratio (ratio Pi / Pc) is 1.2 or more and 4.0 or less. Preferably, the ratio (Pc / Po) is 1.0 or more and 3.0 or less.

  In the golf shoe according to the present invention, the ratios Pi, Pc and Po are appropriate. This golf shoe is excellent in anti-slip performance.

FIG. 1 is a bottom view showing a state in a top position of a shoe for a left foot for a test. FIG. 2 is a bottom view of the left foot shoe of FIG. 1 showing a state in a downswing. FIG. 3 is a bottom view showing the state of the left foot shoe of FIG. 1 in an impact state. FIG. 4 is a bottom view showing the state of the shoe for the right foot for testing in the top position. FIG. 5 is a bottom view of the right foot shoe of FIG. 4 showing a state in a downswing. FIG. 6 is a bottom view showing a state of the right foot shoe of FIG. 4 in an impact state. FIG. 7 is a graph showing the test results. FIG. 8 is a partially cutaway cross-sectional view illustrating a shoe for a shaft foot of a golf shoe according to an embodiment of the present invention. FIG. 9 is a bottom view showing an outsole of the shoe for an foot of FIG. FIG. 10 is a bottom view showing an outsole of a shoe for a kick leg. FIG. 11 is a bottom view showing an outsole of a shoe for a left foot of a golf shoe according to another embodiment of the present invention.

  Hereinafter, the present invention will be described in detail based on preferred embodiments with appropriate reference to the drawings.

  The inventor swung the golfer on a transparent table and observed the outsole. The present inventor has grasped a zone that contacts with a large pressure at each of the top position, the downswing, and the impact. Furthermore, the inventor measured the vertical component of the force applied to the outsole. A three-dimensional floor reaction force meter was used for this measurement. The present inventor proposed in Japanese Patent Application No. 2009-147700 an apparatus for measuring a zone to be grounded and a force.

  FIG. 1 shows the bottom of a left foot shoe 2 for testing. The left foot shoe 2 includes a number of protrusions 4. These protrusions 4 are arranged without deviation. In FIG. 1, the protrusions 4 painted black are the protrusions 4 that are in contact with the transparent base with a pressure equal to or higher than a predetermined value. The unfilled protrusion 4 is a protrusion 4 that is not in contact with the base or in contact with the base with a pressure less than a predetermined value.

  In the test, the left foot shoe 2 is worn by a right-handed golfer. In other words, the left foot shoe 2 is worn on the shaft foot. FIG. 1 shows the result of observation of the left foot shoe 2 at the top position. As is clear from FIG. 1, in the axial foot at the top position, a force is mainly applied to the inside zone.

  FIG. 2 shows a state in which the left foot shoe 2 is in a downswing. As is clear from FIG. 2, force is mainly applied to the inside zone and the center zone in the shaft foot in the downswing.

  FIG. 3 shows the state of the left foot shoe 2 at the impact. As is clear from FIG. 3, in the axial foot in impact, force is mainly applied to the center zone and the outside zone.

  FIG. 4 shows the bottom of the right foot shoe 6 for testing. In the test, the right foot shoe 6 is worn by a right-handed golfer. In other words, the right foot shoe 6 is worn on a kick foot. FIG. 4 shows the result of observation of the right foot shoe 6 at the top position. As is clear from FIG. 4, the kick foot at the top position mainly applies force to the center zone and the outside zone.

  FIG. 5 shows a state in which the right foot shoe 6 is in a downswing. As is clear from FIG. 5, in the kick leg in the downswing, a force is mainly applied to the center zone.

  FIG. 6 shows a state in the impact of the right foot shoe 6. As is clear from FIG. 6, in the kick leg in impact, a force is mainly applied to the inside zone.

  During the impact from the top position, the position of the force applied to the shaft foot shifts from the inside zone to the outside zone through the center zone. During the impact from the top position, the position of the force applied to the kick foot moves from the outside zone to the inside zone through the center zone.

  The result of dividing the vertical force measured by the three-dimensional floor half force meter by the number of protrusions 4 to which this force is applied is shown in the graph of FIG. At the shaft foot, a large force is applied to the protrusion 4 at the top position. In other words, a large force is applied to the protrusion 4 in the inside zone at the shaft foot. In the kick leg, a large force is applied to the protrusion 4 in impact. In other words, a large force is applied to the protrusion 4 in the inside zone at the kick foot. In the axial foot and the kick foot, the force applied to the inside zone is large. Based on such knowledge, the present inventor studied the pattern of the projection 4 of the outsole and came up with the present invention.

  A golf shoe according to an embodiment of the present invention includes a shaft foot shoe 10 and a kick foot shoe 12. 8 and 9 show an axial foot shoe 10. This axial foot shoe 10 is worn by a right-handed golfer. The shaft foot shoe for the left-handed golfer has a shape obtained by inverting the shape of the shaft foot shoe 10 shown in FIG.

  The shaft foot shoe 10 includes an upper 14 and a sole 16. The sole 16 includes an insole 18, a midsole 20 and an outsole 22. In FIGS. 8 and 9, what is indicated by the reference sign X is the width direction, what is indicated by the reference sign Y is the length direction, and what is indicated by the reference sign Z is the vertical direction.

  A known material is used for the upper 14. Natural leather, synthetic leather, artificial leather, woven fabric, or the like can be used for the upper 14. An inner material may be attached to the inner surface of the upper 14. A typical inner material is a woven fabric. A moisture-permeable waterproof material may be used as the inner material. A typical moisture-permeable waterproof material is a bootie made of GORE-TEX (registered trademark).

  The insole 18 is laminated with the midsole 20. The insole 18 is made of woven fabric or foamed synthetic resin. The insole 18 is in contact with the foot. The insole 18 contributes to the slipping of the foot in the operation of putting on the foot shoe 10 for the shaft foot. The insole 18 further contributes to comfort. The insole 18 may not be provided.

  The midsole 20 is made of a foam. Preferably, the midsole 20 includes a number of closed cells. At the time of landing, the midsole 20 undergoes compression deformation. The impact is absorbed by this compression deformation. A preferred base polymer in the midsole 20 is an ethylene-vinyl acetate copolymer (EVA). In light of impact absorption, the midsole 20 preferably has a hardness of 70 or less, particularly preferably 65 or less. From the viewpoint of strength, the hardness is preferably 40 or more. The hardness is measured with a type A durometer in accordance with the rules of “JIS K 6253”.

  The outsole 22 is located below the midsole 20. The outsole 22 is joined to the midsole 20. Bonding can be accomplished with an adhesive. The outsole 22 is made of a crosslinked rubber. Preferred base rubbers include natural rubber (NR), isoprene rubber (IR), butadiene rubber (BR), styrene-butadiene rubber (SBR), acrylonitrile-butadiene rubber (NBR) and urethane rubber. A synthetic resin or an elastomer may be used for the outsole 22. The outsole 22 does not include bubbles. In light of wear resistance, the outsole 22 has a hardness of preferably 70 or greater, and particularly preferably 75 or greater. From the viewpoint of followability to foot deformation, the hardness is preferably 85 or less, and particularly preferably 80 or less. The hardness is measured with a type A durometer in accordance with the rules of “JIS K 6253”.

  FIG. 9 shows the bottom surface of the outsole 22. The outsole 22 includes a base 24 (see FIG. 8) and a number of protrusions 26. Each protrusion 26 protrudes from the base 24. The protrusion 26 has a ground plane (detailed later). The protrusions 26 contribute to the slip resistance performance of the foot shoe 10. From the viewpoint of anti-slip performance, the height of the protrusion 26 is preferably 2 mm or more, particularly preferably 4 mm or more. From the viewpoint of the rigidity of the protrusion 26, the height of the protrusion 26 is preferably 15 mm or less, and particularly preferably 10 mm or less. From the viewpoint of anti-slip performance, the width of the base 24 between the protrusion 26 and another protrusion 26 adjacent thereto is preferably 2 mm or more.

  In FIG. 9, the longest line is indicated by the symbol ML. The longest line ML is the longest line segment that can be drawn within the outline of the bottom surface of the outsole 22. The length of the longest line ML is indicated by the symbol L. What is indicated by the symbol Pt is the toe side end of the longest line ML, and what is indicated by the symbol Ph is the heel side end of the longest line ML. The longest line ML is along the length direction Y.

  FIG. 9 shows an inside reference line Si and an outside reference line So. The inside reference line Si passes through the inside edge Pi of the contour. The inside reference line Si is parallel to the longest line ML. The outside reference line So passes through the outside end Po of the contour. The outside reference line So is parallel to the longest line ML. The distance between the inside reference line Si and the outside reference line So is referred to as a shoe width W.

  FIG. 9 shows a first lane marking S1, a second lane marking S2, a third lane marking S3, and a fourth lane marking S5. These division lines S1, S2, S3, and S4 are each parallel to the longest line ML. The distance from the inside reference line Si to the first lane marking S1 is 0.20W. The distance from the inside reference line Si to the second partition line S2 is 0.40W. The distance from the inside reference line Si to the third partition line S3 is 0.50W. The distance from the inside reference line Si to the fourth lane marking S4 is 0.70W.

  FIG. 9 shows a fifth lane marking S5 and a sixth lane marking S6. The fifth lane marking S5 is orthogonal to the longest line ML at the point P5. The distance from the toe side end Pt of the longest line ML to the point P5 is 0.10L. The sixth partition line S6 is orthogonal to the longest line ML at the point P6. The distance from the toe side end Pt of the longest line ML to the point P6 is 0.40L.

  FIG. 9 shows an inside zone Zi, a center zone Zc, and an outside zone Zo. The inside zone Zi is surrounded by the inside reference line Si, the second lane marking S2, the fifth lane marking S5, and the sixth lane marking S6. The center zone Zc is surrounded by the first lane marking S1, the fourth lane marking S4, the fifth lane marking S5, and the sixth lane marking S6. The outside zone Zo is surrounded by a third lane line S3, an outside reference line So, a fifth lane line S5, and a sixth lane line S6. The inside zone Zi and the center zone Zc partially overlap. The center zone Zc and the outside zone Zo partially overlap. As is clear from FIG. 9, a large number of protrusions 26 are arranged in a biased manner. In the inside zone Zi, the protrusions 26 are densely arranged.

In the present invention, the occupation ratio P is calculated by the following mathematical formula (I).
P = (A1 / A2) · 100 (I)
In this numerical formula (I), A1 is the total area of all the ground planes included in the zone, and A2 is the area of the zone. A1 and A2 are measured in the bottom view shown in FIG.

A1 is calculated by the following mathematical formula.
A1 = A1 (1) + A1 (2) + A1 (3) +... + A1 (n) (II)
In this mathematical formula (II), A1 (m) is the area of the number m contact surface included in the zone, and n is the number of contact surfaces included in the zone. When the protrusions 26 are partially included in the zone, the area of the portion included in the zone in the ground plane is included in the area A1.

  In the measurement of the area A1, a human having a weight of 70 kg wears the axial foot shoe 10 and the kick foot shoe 12. The human stands upright and rests on a hard floor. Humans also walk on this floor. This floor is coated with uncured paint. The stride during walking is 80 cm, and the speed is 60 m / min. The walking distance is 5m. The paint adheres to a part of the bottom surface of the outsole 22 by standing and walking. The part to which the paint is attached is a ground plane.

The outsole 22 satisfies the following mathematical formula.
Pi> Pc ≧ Po
In this equation, Pi is the occupancy ratio of the ground plane in the inside zone Zi, Pc is the occupancy ratio of the ground plane in the center zone Zc, and Po is the occupancy ratio of the ground plane in the outside zone Zo. In the outsole 22, the occupation rate Pi in the inside zone Zi is larger than the occupation rate Pc in the center zone Zc. The occupation rate Pc in the center zone Zc is the same as or larger than the occupation rate Po in the outside zone Zo.

  As is apparent from FIG. 1, in the axial foot shoe 10, a force is applied to the inside zone Zi at the top position. As is clear from FIG. 7, this force is large. Although the occupation ratio Pi in the inside zone Zi is large, since the force at the top position is large, the pressure applied to each protrusion 26 is sufficiently large. Therefore, the protrusion 26 in the inside zone Zi sufficiently pierces the ground (that is, the lawn) at the top position. Since a large number of protrusions 26 exist in the inside zone Zi, the large number of protrusions 26 pierce the ground at the top position. By this piercing, slipping of the foot shoe 10 at the top position is suppressed. This axial foot shoe 10 is excellent in anti-slip performance.

  As is clear from FIG. 2, in the axial foot shoe 10, a force is applied to the center zone Zc in the downswing. As is clear from FIG. 7, this force is small. However, since the occupation ratio Pc in the center zone Zc is small, the pressure applied to each protrusion 26 is sufficiently large. Therefore, the protrusion 26 in the center zone Zc sufficiently pierces the ground in the downswing. By this piercing, slipping of the foot shoe 10 in the downswing is suppressed. This axial foot shoe 10 is excellent in anti-slip performance.

  As is apparent from FIG. 3, in the axial foot shoe 10, a force is applied to the outside zone Zo in impact. As is clear from FIG. 7, this force is small. However, since the occupation ratio Po in the outside zone Zo is small, the pressure applied to each protrusion 26 is sufficiently large. Therefore, the protrusion 26 in the outside zone Zo sufficiently pierces the ground in impact. By this piercing, slipping of the foot shoe 10 due to impact is suppressed. This axial foot shoe 10 is excellent in anti-slip performance.

  Although a large force is applied to the inside zone Zi, since the area of the contact surface of the inside zone Zi is large, an extreme inclination of the outsole 22 is prevented. This axial foot shoe 10 can contribute to the stability of the swing.

  The ratio (Pi / Pc) between the occupation ratio Pi and the occupation ratio Pc is preferably 1.2 or more and 4.0 or less. The foot shoe 10 having the ratio (Pi / Pc) within the above range is excellent in the anti-skid performance at the top position and the downswing. From the viewpoint of anti-slip performance, the ratio (Pi / Pc) is more preferably 1.5 or more, and particularly preferably 2.0 or more. In light of anti-slip performance, the ratio (Pi / Pc) is more preferably equal to or less than 3.5, and particularly preferably equal to or less than 3.3.

  The ratio (Pc / Po) between the occupation ratio Pc and the occupation ratio Po is preferably 1.0 or more and 3.0 or less. The foot shoe 10 having a ratio (Pc / Po) within the above range is excellent in anti-slip performance in downswing and impact. From the viewpoint of anti-slip performance, the ratio (Pc / Po) is more preferably 1.2 or more, and particularly preferably 1.4 or more. From the viewpoint of anti-slip performance, the ratio (Pc / Po) is more preferably 2.6 or less, and particularly preferably 2.2 or less.

  From the viewpoint of anti-slip performance at the top position, the occupation ratio Pi is preferably 20% or more and 80% or less. From the viewpoint of anti-slip performance in downswing, the occupation ratio Pc is preferably 10% or more and 70% or less. From the viewpoint of anti-slip performance in impact, the occupation ratio Po is preferably 5% or more and 60% or less.

  FIG. 10 shows the bottom surface of the outsole 28 of the boot 12 for a kick leg. The material of the outsole 28 is the same as the material of the outsole 22 shown in FIG. Although not shown, the shoe 12 for a kick foot includes an upper, an insole, and a midsole. The materials of the upper, the insole and the midsole are the same as the materials of the upper 14, the insole 18 and the midsole 20 of the shoe for a foot shown in FIG. The kick shoe 12 is worn by a right-handed golfer. The boot for a left-handed golfer has a shape obtained by inverting the shape of the boot 12 for a kick foot shown in FIG.

  The outsole 28 includes a base and a number of protrusions 30. Each protrusion 30 protrudes from the base. The protrusion 30 has a grounding surface. The protrusion 30 contributes to the anti-slip performance of the kick shoe 12. From the viewpoint of anti-slip performance, the height of the protrusion 30 is preferably 2 mm or more, and particularly preferably 4 mm or more. From the viewpoint of the rigidity of the protrusion 30, the height of the protrusion 30 is preferably 15 mm or less, and particularly preferably 10 mm or less. From the viewpoint of anti-slip performance, the width of the base between the protrusion 30 and the other protrusion 30 adjacent thereto is preferably 2 mm or more.

  In FIG. 10, as in FIG. 9, the longest line ML, the inside reference line Si, the outside reference line So, the first lane marking S1, the second lane marking S2, the third lane marking S3, and the fourth lane marking S4. A fifth lane marking S5 and a sixth lane marking S6 are shown. FIG. 10 further shows an inside zone Zi, a center zone Zc, and an outside zone Zo. The inside zone Zi is surrounded by the inside reference line Si, the second lane marking S2, the fifth lane marking S5, and the sixth lane marking S6. The center zone Zc is surrounded by the first lane marking S1, the fourth lane marking S4, the fifth lane marking S5, and the sixth lane marking S6. The outside zone Zo is surrounded by a third lane line S3, an outside reference line So, a fifth lane line S5, and a sixth lane line S6. The inside zone Zi and the center zone Zc partially overlap. The center zone Zc and the outside zone Zo partially overlap. As is clear from FIG. 9, a large number of protrusions 30 are arranged in a biased manner. In the inside zone Zi, the protrusions 30 are densely arranged.

The outsole 28 satisfies the following mathematical formula.
Pi> Pc ≧ Po
In this equation, Pi is the occupancy ratio of the ground plane in the inside zone Zi, Pc is the occupancy ratio of the ground plane in the center zone Zc, and Po is the occupancy ratio of the ground plane in the outside zone Zo. In the outsole 28, the occupation rate Pi in the inside zone Zi is larger than the occupation rate Pc in the center zone Zc. The occupation rate Pc in the center zone Zc is the same as or larger than the occupation rate Po in the outside zone Zo.

  As is clear from FIG. 4, in the foot boot 12, a force is applied to the outside zone Zo at the top position. As is clear from FIG. 7, this force is small. However, since the occupation ratio Po in the outside zone Zo is small, the pressure applied to each protrusion 30 is sufficiently large. Therefore, the protrusion 30 in the outside zone Zo sufficiently pierces the ground at the top position. By this piercing, slipping of the shoe 12 for a kick leg at the top position is suppressed. The kick shoe 12 is excellent in anti-slip performance.

  As is clear from FIG. 5, the kick shoe 12 applies a force to the center zone Zc during the downswing. As is clear from FIG. 7, this force is small. However, since the occupation ratio Pc in the center zone Zc is small, the pressure applied to each protrusion 30 is sufficiently large. Accordingly, the protrusion 30 in the center zone Zc sufficiently pierces the ground in the downswing. By this piercing, slipping of the shoe 12 for a kick leg in a downswing is suppressed. The kick shoe 12 is excellent in anti-slip performance.

  As is clear from FIG. 6, the kick shoe 12 applies a force to the inside zone Zi in impact. As is clear from FIG. 7, this force is large. Although the occupation ratio Pi in the inside zone Zi is large, since the force at impact is large, the pressure applied to each protrusion 30 is sufficiently large. Therefore, the protrusion 30 in the inside zone Zi sufficiently pierces the ground in impact. Since there are a large number of protrusions 30 in the inside zone Zi, a large number of protrusions 30 pierce the ground due to impact. By this piercing, slipping of the shoe 12 for a kick leg due to impact is suppressed. The kick shoe 12 is excellent in anti-slip performance.

  Although a large force is applied to the inside zone Zi, since the area of the contact surface of the inside zone Zi is large, an extreme inclination of the outsole 28 is prevented. The kick shoe 12 can contribute to the stability of the swing.

  The ratio (Pi / Pc) between the occupation ratio Pi and the occupation ratio Pc is preferably 1.2 or more and 4.0 or less. The kick shoe 12 having the ratio (Pi / Pc) within the above range is excellent in anti-slip performance in downswing and impact. From the viewpoint of anti-slip performance, the ratio (Pi / Pc) is more preferably 1.5 or more, and particularly preferably 2.0 or more. In light of anti-slip performance, the ratio (Pi / Pc) is more preferably equal to or less than 3.5, and particularly preferably equal to or less than 3.3.

  The ratio (Pc / Po) between the occupation ratio Pc and the occupation ratio Po is preferably 1.0 or more and 3.0 or less. The kick shoe 12 having the ratio (Pc / Po) within the above range is excellent in the anti-slip performance in the top position and the downswing. From the viewpoint of anti-slip performance, the ratio (Pc / Po) is more preferably 1.2 or more, and particularly preferably 1.4 or more. From the viewpoint of anti-slip performance, the ratio (Pc / Po) is more preferably 2.6 or less, and particularly preferably 2.2 or less.

  From the viewpoint of anti-slip performance in impact, the occupation ratio Pi is preferably 20% or more and 80% or less. From the viewpoint of anti-slip performance in downswing, the occupation ratio Pc is preferably 10% or more and 70% or less. From the viewpoint of anti-slip performance at the top position, the occupation ratio Po is preferably 5% or more and 60% or less.

  FIG. 11 is a bottom view showing an outsole 34 of a shoe 32 for a left foot of a golf shoe according to another embodiment of the present invention. The material of the outsole 34 is the same as the material of the outsole 22 shown in FIG. Although not shown, the left foot shoe 32 includes an upper, an insole, and a midsole. The materials of the upper, the insole and the midsole are the same as the materials of the upper 14, the insole 18 and the midsole 20 of the shoe for a foot shown in FIG.

  The outsole 34 includes a base and a number of protrusions 36. Each protrusion 36 protrudes from the base. The protrusion 36 has a grounding surface. This protrusion 36 contributes to the anti-slip performance of the left foot shoe 32. From the viewpoint of anti-slip performance, the height of the protrusion 36 is preferably 2 mm or more, and particularly preferably 4 mm or more. From the viewpoint of the rigidity of the protrusion 36, the height of the protrusion 36 is preferably 15 mm or less, and particularly preferably 10 mm or less. From the viewpoint of anti-slip performance, the width of the base between the protrusion 36 and the other protrusion 36 adjacent thereto is preferably 2 mm or more.

  In FIG. 11, similarly to FIG. 9, the longest line ML, the inside reference line Si, the outside reference line So, the first lane line S1, the second lane line S2, the third lane line S3, and the fourth lane line S4. A fifth lane marking S5 and a sixth lane marking S6 are shown. FIG. 11 further shows an inside zone Zi, a center zone Zc, and an outside zone Zo. The inside zone Zi is surrounded by the inside reference line Si, the second lane marking S2, the fifth lane marking S5, and the sixth lane marking S6. The center zone Zc is surrounded by the first lane marking S1, the fourth lane marking S4, the fifth lane marking S5, and the sixth lane marking S6. The outside zone Zo is surrounded by a third lane line S3, an outside reference line So, a fifth lane line S5, and a sixth lane line S6. The inside zone Zi and the center zone Zc partially overlap. The center zone Zc and the outside zone Zo partially overlap. As is clear from FIG. 11, a large number of protrusions 36 are arranged in a biased manner. In the inside zone Zi, the protrusions 36 are densely arranged.

  When the left foot shoe 32 is worn by a right-handed golfer, the left foot shoe 32 is a shaft foot shoe. When the left foot shoe 32 is worn by a left-handed golfer, the left foot shoe 32 is a kick foot shoe. Although not shown, the right foot shoe has a shape obtained by inverting the shape of the left foot shoe 32. When the right foot shoe is worn by a right-handed golfer, the right foot shoe is a kick foot shoe. When the right foot shoe is worn by a left-handed golfer, the right foot shoe is a shaft foot shoe.

The outsole 34 satisfies the following mathematical formula.
Pi> Pc ≧ Po
In this equation, Pi is the occupancy ratio of the ground plane in the inside zone Zi, Pc is the occupancy ratio of the ground plane in the center zone Zc, and Po is the occupancy ratio of the ground plane in the outside zone Zo. In the outsole 34, the occupation rate Pi in the inside zone Zi is larger than the occupation rate Pc in the center zone Zc. The occupation rate Pc in the center zone Zc is the same as or larger than the occupation rate Po in the outside zone Zo.

  When the left foot shoe 32 is worn by a right-handed golfer, a force is applied to the inside zone Zi at the top position. This power is great. Although the occupation ratio Pi in the inside zone Zi is large, since the force at the top position is large, the pressure applied to each protrusion 36 is sufficiently large. Therefore, the protrusion 36 in the inside zone Zi sufficiently pierces the ground at the top position. Since there are a large number of protrusions 36 in the inside zone Zi, a large number of protrusions 36 pierce the ground at the top position. By this piercing, the slip of the shaft leg at the top position is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  When the left foot shoe 32 is worn by a left-handed golfer, a force is applied to the inside zone Zi in impact. This power is great. Although the occupation ratio Pi in the inside zone Zi is large, since the force at impact is large, the pressure applied to each protrusion 36 is sufficiently large. Therefore, the protrusion 36 in the inside zone Zi sufficiently pierces the ground in impact. Since a large number of protrusions 36 exist in the inside zone Zi, the large number of protrusions 36 pierce the ground due to impact. By this piercing, slipping of the kick leg at impact is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  When the left foot shoe 32 is worn by a right-handed golfer, a force is applied to the center zone Zc in the downswing. This force is small. However, since the occupation ratio Pc in the center zone Zc is small, the pressure applied to each protrusion 36 is sufficiently large. Therefore, the protrusion 36 in the center zone Zc sufficiently pierces the ground in the downswing. By this piercing, the slip of the shaft leg in the downswing is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  When the left foot shoe 32 is worn by a left-handed golfer, a force is applied to the center zone Zc in the downswing. This force is small. However, since the occupation ratio Pc in the center zone Zc is small, the pressure applied to each protrusion 36 is sufficiently large. Therefore, the protrusion 36 in the center zone Zc sufficiently pierces the ground in the downswing. By this piercing, the slip of the kick leg in the downswing is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  When the left foot shoe 32 is worn by a right-handed golfer, a force is applied to the outside zone Zo in impact. This force is small. However, since the occupation ratio Po in the outside zone Zo is small, the pressure applied to each protrusion 36 is sufficiently large. Accordingly, the protrusion 36 in the outside zone Zo sufficiently pierces the ground in impact. By this piercing, the slip of the shaft leg at the impact is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  When the left foot shoe 32 is worn by a left-handed golfer, a force is applied to the outside zone Zo at the top position. This force is small. However, since the occupation ratio Po in the outside zone Zo is small, the pressure applied to each protrusion 36 is sufficiently large. Accordingly, the protrusion 36 in the outside zone Zo sufficiently pierces the ground at the top position. By this piercing, the slip of the kick leg at the top position is suppressed. The left foot shoe 32 is excellent in anti-slip performance.

  Although a large force is applied to the inside zone Zi, since the area of the contact surface of the inside zone Zi is large, an extreme inclination of the outsole 34 is prevented. This axial foot shoe can contribute to the stability of the swing.

  From the viewpoint of anti-slip performance, the ratio (Pi / Pc) between the occupation ratio Pi and the occupation ratio Pc is preferably 1.2 or more and 4.0 or less. The ratio (Pi / Pc) is more preferably 1.5 or more, and particularly preferably 2.0 or more. The ratio (Pi / Pc) is more preferably 3.5 or less, and particularly preferably 3.3 or less.

  From the viewpoint of anti-slip performance, the ratio (Pc / Po) between the occupation ratio Pc and the occupation ratio Po is preferably 1.0 or more and 3.0 or less. The ratio (Pc / Po) is more preferably 1.2 or more, and particularly preferably 1.4 or more. The ratio (Pc / Po) is more preferably 2.6 or less, and particularly preferably 2.2 or less.

  The occupation ratio Pi is preferably 20% or more and 80% or less. The occupation ratio Pc is preferably 10% or more and 70% or less. The occupation ratio Po is preferably 5% or more and 60% or less.

  As described above, the right foot shoe has a shape obtained by inverting the shape of the left foot shoe 32. Therefore, when this right foot shoe is worn by a right-handed golfer, the kick foot slip is suppressed at the top position, downswing and impact. When this right foot shoe is worn by a left-handed golfer, the slip of the shaft foot is suppressed at the top position, downswing and impact.

  Hereinafter, the effects of the present invention will be clarified by examples. However, the present invention should not be construed in a limited manner based on the description of the examples.

[Example 1]
A rubber composition containing polybutadiene as a base material was put into a mold, pressurized and heated to obtain an outsole. The outsole was assembled with an upper, a midsole and an insole to produce a golf shoe. In this golf shoe, the outsole of the shaft foot shoe has a shape obtained by inverting the shape of the outsole of the kick foot shoe. The occupation ratio is shown in Table 1 below.

[Example 2-5 and Comparative Example 1]
Golf shoes of Example 2-5 and Comparative Example 1 were obtained in the same manner as in Example 1 except that other molds were used and the occupation ratio was as shown in Table 1 below.

[Evaluation]
A golf shoe was worn by a golfer, and a golf ball was hit with a driver on the golf course tee. Ten golfers were rated for anti-slip performance and ease of swinging. This average value is shown in Table 1 below. A larger value is more preferable.

  As shown in Table 1, the golf shoes of the examples are excellent in anti-slip performance. From this evaluation result, the superiority of the present invention is clear.

  The golf shoe according to the present invention can be worn when playing on a golf course. This golf shoe can also be worn when practicing in the driving range.

10 ... Shoes for shaft feet 12 ... Shoes for kick feet 22, 28, 34 ... Outsole 26, 30, 36 ... Protrusions 32 ... Shoes for left feet ML ... Longest line Zi・ ・ Inside zone Zc ・ ・ ・ Center zone Zo ・ ・ ・ Outside zone

Claims (2)

Axial foot shoes and kick foot shoes,
Each of the shoe for the foot and the shoe for the kick foot has an outsole that satisfies the following two formulas,
A golf shoe in which the outsole has a base and a plurality of protrusions protruding from the base and including a ground contact surface.
Pi> Pc ≧ Po
4.0 ≧ (Pi / Pc) ≧ 1.2
(In this equation, Pi is the occupancy ratio of the ground plane in the inside zone, Pc is the occupancy ratio of the ground plane in the center zone, and Po is the occupancy ratio of the ground plane in the outside zone. The length of the longest line that can be drawn on the contour is the length L, and a straight line that passes through the inside end of the contour and is parallel to the longest line is the inside reference line, and passes through the outside end of the contour. A straight line parallel to the longest line is an outside reference line, a distance between the inside reference line and the outside reference line is a width W, a distance from the inside reference line is 0.20 W, and the longest line is A parallel straight line is defined as the first comparting line, a distance from the inside reference line is 0.40 W, and a straight line parallel to the longest line is defined as the second comparting line. A straight line parallel to the longest line is 0.50W and the straight line parallel to the longest line is 0.70W, and a straight line parallel to the longest line is the fourth comparting line. A straight line that passes through a point on the longest line whose distance from the toe side end of the longest line is 0.10 L and is orthogonal to the longest line is a fifth division line, and a distance from the toe side end of the longest line is 0 When a straight line that passes through a point on the longest line of 40 L and is orthogonal to the longest line is the sixth lane line, it is surrounded by the inside reference line, the second lane line, the fifth lane line, and the sixth lane line. The inside zone is the center zone, surrounded by the first lane line, the fourth lane line, the fifth lane line, and the sixth lane line, and the third lane line and the outside reference line. The outside zone is surrounded by the fifth and sixth lane lines. The golf shoe according to claim 1, wherein the ratio (Pc / Po) is 1.0 or more and 3.0 or less.

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