JP4352461B2 - Golf club - Google Patents

Description

The present invention relates to a wedge type golf club.

  Golf clubs are broadly divided into wood types that aim to fly low and fly far away, iron types that hit high and back spin (reverse rotation), and capture the target position from above and putters used on the green .

  Of the iron-type golf clubs, pitching wedges are used for shots up to approximately 110 yards (101m) in flight distance, and mainly designed for bunker play for shots up to approximately 80 yards (73m). Sand wedges are used.

  In these wedges, the inclination angle of the face surface (ball striking surface), that is, the loft angle is set to approximately 52 to 56 degrees, and the inclination angle of the shaft, that is, the lie angle is set to approximately 64 degrees.

  The head of such an iron type golf club is provided with a sole surface serving as a ground contact surface at the bottom and a face surface serving as a ball striking surface on the front surface, a score line is formed on the face surface, and a toe and heel are further formed on the head. In addition, a hosel for attaching a shaft and the like are formed, and a recess is formed on the back surface (for example, Patent Document 1).

  By the way, in an approach shot when a golf ball is shot and placed on the green, a pitch end run or a pitch shot is used. These are ball hitting methods that apply a backspin (reverse rotation) to the ball and hit it relatively high by hitting it relatively high, especially for pitch shots. This is a hitting method.

Conventionally, small grooves called score lines are formed in multiple stages on the face surface as means for applying backspin to a ball at the time of hitting. Then, as a score line for strongly applying backspin, a score line is provided on the face surface by pressing, and then the face surface is made flat by machining or pressing, and the angle of the edge portion of the score line is sharply formed. The same applicant has proposed a golf club head in which the ball can be easily caught on the edge portion, and the ball can be effectively spun (for example, Patent Document 2).
JP-A-7-255879 (FIGS. 1 and 7) JP 2003-199851 A

  However, since the face surface and score line have a great influence on the spin performance, they are restricted by golf rules in particular, and there are limits to the improvements to the edge of the score line, as in the prior art. The sharp edge portion may cause the ball to be cut when hit.

  In addition, when the angle of the edge portion of the score line is formed sharply as in the prior art, the ball is likely to be caught on the edge portion and backspin is easily applied, but the score line is slight but sharp every time it is shot. In addition to the decrease, there is a problem that the edge portion cannot be secured due to sand entering the score line especially in the bunker shot.

The problem to be solved is that, in a wedge type golf club in which a shaft is connected to a head having a score line formed on the face surface, powerful backspin is possible regardless of the face surface side having the score line. is there.

In the first aspect of the present invention, a sole surface serving as a ground contact surface is provided at a lower portion, a face surface serving as a hitting surface is provided at a front surface with a loft angle of 52 to 56 degrees, and a shaft connecting portion is provided on one side. 21. In a wedge-type golf club in which a score line is formed on the face surface of the head and a shaft is connected to the shaft connecting portion, a height distance from a horizontal plane in contact with the sole surface of the head to a center of gravity position of the head is A wedge-type golf club having a diameter of 335 mm or more and formed larger than the radius of the ball, wherein the center of gravity of the head is provided in front of the face surface and behind the tip of the sole surface .

According to the first aspect of the present invention, the center of gravity of the head is arranged above the center of the ball at the time of a shot, so that when the ball is hit, the face surface is rotated downward by the impact. Thus, the backspin of the ball can be accelerated by the gear effect. Further, by using the golf club as a wedge, an approach shot from around the green can be accurately performed. Furthermore, a height distance equal to or greater than the radius of the ball in the current golf rules can be secured. Moreover, by providing the center of gravity in front of the face surface and behind the tip of the sole surface, the ball launch angle at the time of hitting is reduced, and the ball is easily caught on the edge of the score line. Can effectively backspin.

  Preferred embodiments of the present invention will be described with reference to the accompanying drawings. The embodiments described below do not limit the contents of the present invention described in the claims. In addition, all the configurations described below are not necessarily essential requirements of the present invention.

  FIGS. 1 to 6 show Example 1, which shows a case of a wedge such as a pitching wedge, an approach wedge or a sand wedge among iron type golf clubs, and a face surface which becomes a hitting surface A shaft mounting portion 3 called a hosel or the like is provided on one side of a head 2 having 1 on the front, and a base end of a shaft 4 is connected to the shaft mounting portion 3. A grip 5 is provided at the tip of the shaft 4.

  The head 2 is formed of steel or a combination of steel and other materials. In the embodiment, the head 2 is formed of steel, and the head 2 serves as a ground plane at the bottom. A sole surface 6, a heel 7 on the lower part on one side, a top 8 on the upper part, and a toe 9 on the other side of the top 8 are formed. The score line 10 is formed in a small groove shape on the face surface 1 in multiple stages at intervals. The face surface 1 is inclined with a loft angle δ with respect to a perpendicular to the horizontal surface 6A in contact with the sole surface 6.

  In terms of weight, the head 2 is integrally formed with four parts: a face surface member 11, a rear lower part 12, a rear upper part 13, and a shaft attachment part 3. The face surface member 11 is substantially plate-shaped around the face surface 1, and includes at least the face surface 1, the front portion of the sole surface 6, the top 8, the toe 9, and the heel 7. A lower projecting portion 15 is formed on the rear lower portion 12 so as to include the rear portion of the sole surface 6, and the upper surface 16 of the lower projecting portion 15 is the sole surface 6 or the sole surface 6. Is disposed at a position lower than approximately half of the face surface height A with respect to the horizontal plane 6A in contact with the surface 6A, and is disposed so as to be substantially orthogonal to the surface direction of the face surface 1. A concave portion 17 is formed in an undercut shape downward. The horizontal surface 6A of the sole surface 6 is based on the ground contact surface at the time of addressing the golf club. On the other hand, the rear upper part 13 is connected to the top 8 and the toe 9 and an upper projecting part 18 is formed on the rear side of the face surface member 11. The upper projecting part 18 is solid and has a lower surface 19. Is disposed at a position higher than approximately half of the face surface height A, and is disposed so as to be substantially orthogonal to the surface direction of the face surface 1. Therefore, a space where the recess 20 is connected to the rear so that the upper surface 16 and the lower surface 19 are sandwiched between the rear surface center of the face surface member 11, that is, at approximately a half of the face surface height A of the face surface member 11. It is formed. The face surface member 11, the rear lower portion 12, the rear upper portion 13, and the shaft mounting portion 3 are not arranged with a clear boundary but are arranged in a row.

  Then, the maximum protrusion length of the lower protrusion 15 in the rear lower portion 12 to the rear, that is, the distance B between the rear end 15A of the lower protrusion 15 and the face surface 1, the upper protrusion in the rear upper portion 13 is provided. By increasing the maximum rearward projection length of the portion 18, that is, the distance C between the rear end 18A of the upper projecting portion 18 and the face surface 1 (B <C), the volume of the rear lower portion 12, and hence the weight Is larger than the volume of the upper portion 13 on the rear side, and hence the weight. As a result, the golf club to be hit by the face surface 1 has a height distance D between the center of gravity 21 of the head 1 and the sole surface 6 or the horizontal surface 6A of the sole surface 6. It is formed higher than the center 23 of the ball 22 for use. That is, the shortest length between the gravity center position 21 of the head 2 and the sole surface 6 or the horizontal surface 6A of the sole surface 6 is formed larger than the radius E of the ball 22. Since the diameter of the ball 22 is 42.67 mm according to the current rule, the height distance D is set to be larger than the radius E21.335 mm. The upper limit of the height distance D is the face surface height A.

  The height distance D is specifically 23 mm, for example. This is because, for example, the conventional one is about 19.8 mm or 20.4 mm, so that the position of the center of gravity 21 is increased by about 16 to 13%.

  Further, the barycentric position 21 disposed substantially at the center in the width direction of the face surface 1 is disposed in front of the face surface 1. The gravity center position 21 is located behind the front end of the sole surface 6 (the lower end of the face surface 1) even if it is ahead of the face surface 1.

  Next, the operation of the above configuration will be described. For example, when a pitch shot is performed using a wedge of an iron type golf club as described above, the head 2 swings down with a circular arc so as to enter the ball 22 downward. At this time, the face surface 1 hits the ball 22 in contact with the ball 22 so as to enter downward. As a result, in FIG. 2 and FIG. 3, the ball 22 is caught by the edge portion 10 </ b> A of the score line 10, and the ball 22 rotates counterclockwise. Further, at the time of hitting the ball, when the ball 22 collides with the head 2, the center of gravity 21 is located above the center 23 of the ball 22, so the face surface 1 is instantaneously pulled down on the sole surface 6 side as shown in FIGS. It rotates in the clockwise direction R so that the surface 1 rises. That is, the loft angle δ instantaneously decreases, and as a result, the ball rubbed against the face surface 1 is given a rotation in the direction opposite to the rotation of the face surface 1 by the rotation action of the face surface 1. A so-called gear effect occurs, and the backspin is accelerated.

  Further, the height distance D of the center of gravity 21 is larger than the radius E of the ball 22 at the time of hitting, and the center of gravity 21 of the head 2 is provided in front of the face surface 1 so that the center of gravity 21 is the center of the ball 22 at the time of shot. Since the ball is above 23, the hit ball 22 jumps out relatively low. That is, the ball jump angle θ becomes small. As a result, the ball 22 is easily caught on the edge portion 10A of the score line 10, and the back spin can be effectively applied to the ball 22. On the other hand, if the height distance D is smaller than the radius E of the ball 22, the center of gravity 21 is below the center 23 of the ball 22, so the pop-out angle θ increases and the ball 22 is caught by the edge portion 10 A of the score line 10. This makes it difficult to spin the ball 22.

  In this way, at the time of pitch shot, the ball 22 flies low and falls onto the green, and since the dropped ball 22 is subjected to strong backspin, it stops at or near the desired drop point. .

  As described above, in the embodiment, in the golf club in which the shaft 4 is connected to the head 2 in which the score line 10 is formed on the face surface 1, the head from the sole surface 6 of the head 2 or the horizontal surface 6 A of the sole surface 6. When the ball 22 collides with the head 2 at the time of a shot, the face surface 1 instantaneously becomes the sole surface 6 when the ball 22 collides with the head 2 during a shot. By rotating so that the face surface 1 is pulled down and the face surface 1 is raised, the ball rubbed against the face surface 1 is imparted with a rotation in the opposite direction to the rotation of the face surface 1 and accelerates the backspin by a so-called gear effect. Will be able to.

  Further, an upper projecting portion 18 and a lower projecting portion 15 are provided at the upper and lower portions of the back surface of the head 2 in the rearward direction with a space therebetween, and the rear end 18A of the upper projecting portion 18 and the face surface 1 are provided. Since the center of gravity 21 of the head 1 is arranged upward by forming the distance C to be larger than the distance B between the rear end 15A of the lower protruding portion 15 and the face surface 1, the upper protruding portion The height distribution D from the sole surface 6 of the head 2 or the horizontal surface 6A of the sole surface 6 to the center of gravity position 21 of the head 2 can be freely adjusted by the weight distribution of the 18 and the lower projecting portion 15. In this way, since the moment of inertia in the vertical direction can be increased, the fluctuation in the vertical direction during the shot is reduced, and the flying directionality can be improved.

  Furthermore, by forming the concave portion 17 on the upper surface 16 of the lower projecting portion 15, the weight corresponding to the concave portion 17 can be reduced in the lower projecting portion 15, and the position adjustment of the center of gravity position 21 is made easier. It can be carried out.

  Further, by using such a golf club having a center of gravity as a wedge, an approach shot from around the green can be accurately performed.

  Moreover, by forming the height distance D to be 21.335 mm or more, a height distance equal to or greater than the radius of the ball 22 in the current golf rules can be secured.

  In addition, by providing the center of gravity 21 of the head 2 in front of the face surface 1, the pop-out angle θ is reduced, and as a result, the ball 22 is easily caught on the edge portion 10A of the score line 10, and the score line 10 such as a bunker is attached. Even if the shot is likely to be clogged with sand, the ball 22 can be backspun effectively.

  FIG. 7 shows the second embodiment, and the same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted. In the second embodiment, the specific gravity of the material of the upper part 2A on the top 8 side of the head 2 is larger than the specific gravity of the material of the other lower part 2B, that is, the material forming the sole surface 6, etc. Is formed larger than the radius E of the ball 22. Thus, the head 2 may be formed by combining materials having different specific gravities instead of shapes.

  As described above, the golf club according to the present invention can be applied to various uses such as other iron type and wood type.

It is a front side perspective view which shows Example 1 of this invention. It is a side view which shows Example 1 of this invention. It is sectional drawing which shows Example 1 of this invention. It is a back side perspective view showing Example 1 of the present invention. It is a disassembled perspective view which shows Example 1 of this invention. It is sectional drawing which shows Example 2 of this invention.

DESCRIPTION OF SYMBOLS 1 Face surface 2 Head 3 Shaft attaching part 4 Shaft 6 Sole surface 6A Extension line
10 Scoreline
15 Lower projection
15A rear end
16 Top view
17 Recess
18 Upper projection
18A rear end
21 Center of gravity
22 Ball B Distance C Distance D Height distance E Radius δ Loft angle

Claims (1)

A head surface having a bottom surface provided with a sole surface serving as a ground contact surface, a face surface serving as a ball striking surface having a loft angle of 52 to 56 degrees, and a shaft connecting portion provided on one side. In a wedge-type golf club in which a score line is formed on a surface and a shaft is connected to the shaft connection portion, a height distance from a horizontal plane in contact with the sole surface of the head to a center of gravity position of the head is 21.335 mm or more A wedge-type golf club , which is formed larger than the radius of the ball, and the center of gravity of the head is provided in front of the face surface and behind the tip of the sole surface .

Images