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Wood club head

Wood club head description/claims

1. Field of the Invention

The present invention relates to a wood club head having a loft angle of 13° or more, or a head of so-called fairway wood.

2. Description of the Related Art

In a conventional fairway wood, the amount of spin, the ball grippability, and the like are designed by variously changing the values of a barycenter depth (ZG) representing the distance from the face to the barycenter, a face progression (FP) representing the distance from the shaft axis to the leading edge of the face, and a hosel length representing the length of the cylindrical portion of the hosel. When the value ZG is large, the face tends to be directed more upward upon impact, and the ball can spin and rise higher more easily. The larger the FP value, the more easily the ball tends to rise high, but the worse ball grippability becomes. A loft angle is the measurement value of an angle formed by the shaft and face when the face is set in a square state, and represents the upward angle of the face. For an ordinary golfer whose head speed is not high, a fairway wood is generally designed to grip and spin the ball well so the ball rises high easily.

As a golf club head that is focused on the FP value, one with an FP vale falling within a range of 7 mm to 20 mm (both inclusive) is known (for example, see Japanese Patent Laid-Open No. 11-178958). Another golf club head that is focused on the barycenter depth (ZG) is also known (for example, Japanese Patent Laid-Open No. 2002-210045).

None of Japanese Patent Laid-Open Nos. 11-178958 and 2002-210045 provides a golf club head which is designed by combining the ZG and FP values and the hosel length of the fairway wood so that a golfer having a high head speed can hit a ball with it easily. If only the ZG and FP values are so designed that the ball can rise high easily, when the golfer having a high head speed hits a ball with the golf club head, the ball rises too high. Such a ball tends to yield to the wind and lose its traveling distance.

The present invention is made by taking also the hosel length into account, and has as its object to provide a wood club head which can be adapted to different hosel lengths so that when a golfer having a high head speed hits a ball with it, the ball can rise high easily but does not rise too high, providing a strong trajectory and a long traveling distance.

According to the present invention, there is provided a wood club head having a loft angle of not less than 13°, wherein a hosel length is of not less than 20 mm, a face progression (FP value) is set to fall within a range of 12 mm to 16 mm (both exclusive), and a barycenter depth is set to fall within a range of 20 mm to 25 mm (both exclusive).

According to the present invention, since the hosel length is of not less than 20 mm, the club head tends to draw a sweep (obtuse) trajectory upon impact and the loft tends to be at a high angle so that the ball tends to rise high easily. By decreasing the ZG value and FP value, the ball does not rise too high, so that a strong trajectory can be obtained. The traveling distance also increases.

According to the present invention, there is provided a wood club head having a loft angle of not less than 13°, wherein a hosel length is of not more than 20 mm, a face progression (FP value) is set to fall within a range of 16 mm to 20 mm (both exclusive), and a barycenter depth is set to fall within a range of 25 mm to 30 mm (both exclusive).

According to the present invention, since the hosel length is of not more than 20 mm, the club head tends to draw a down blow (acute) trajectory upon impact and the loft tends to be at a low angle so that the ball does not rise high easily. By increasing the FP value, the face tends to be opened upon impact and by increasing the ZG so the ball spin easily, the ball is prevented from rising too high. Then, a strong ball flight and a long traveling distance can be obtained.

Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).

FIG. 1 is a side view showing an embodiment of the present invention; and

FIG. 2 is a front view showing the embodiment of the present invention.

• Provisional Patent
• Utility Patent

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