JP2008220731A - Wood type golf club head and wood type golf club - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wood type golf club which obtains a stable action in a golf club head in swinging and is excellent in operability and ball shooting directionality. <P>SOLUTION: The wood type golf club has the golf club head which satisfies -2<VZG-2×FP<2 when the progression amount (face progression) of a face 4 with respect to the shaft axis S of a leading edge 41 is defined as FP, and a horizontal distance (gravity center depth) of the face 4 with respect to the depth direction of the center of gravity G in the leading edge 41 is defined as VZG concerning the wood type golf club where a loft angle is not more than 15°. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a wood-type golf club, and more particularly to a wood-type golf club having a loft angle of 15 degrees or less.

  In the golf club, the shape of the head has a great influence on the operability, the hitting direction, and the like. Therefore, face progression (FP), which is the distance from the shaft axis to the tip of the face (leading edge), the position of the center of gravity, depth of center of gravity (VZG), which is the distance from the center of gravity to the tip of the face (leading edge), from the face to the center of gravity The center of gravity depth (ZG), the loft angle, the center of gravity distance (GL) from the shaft axis to the center of gravity, and the height of the sweet spot are adjusted to make it easy to catch, operability, and directionality In order to improve the above, heads with various designs have been provided and proposed.

  Face progression (FP) is generally regarded as an element of catching when it is small, and when it is large, catching is bad. Here, “good catch” means that the head is easy to return and hooks (hard to slice), and “bad” means that the head is hard to return and easy to slice (hard to hook). Further, the center of gravity depth (VZG) means the relative center of gravity depth at the head, and generally, the larger the center of gravity depth, the easier it is to catch.

  However, if it is caught too much or conversely too much, the operability is deteriorated and the direction of hitting ball becomes unstable. These phenomena are thought to be due to the lack of stability in the behavior of the golf club head during the swing and the inability to control the stable return of the head. It is speculated that it is determined by the relationship between the striking point, the center of gravity, and the shaft axis as a factor controlling the condition, but no clear relationship has been found.

  In the design of such a golf club head, a golf club head that focuses on the value of FP has been proposed in which the FP value is in the range of 7 mm to 20 mm (see Patent Document 1). In addition, a technique focusing on the depth of center of gravity (ZG) has been proposed (see Patent Document 2).

Japanese Patent Laid-Open No. 11-178958 Japanese Patent Laid-Open No. 2002-210045

  However, if only one value such as FP value or ZG value is specified, the behavior of the golf club head during the swing cannot be made stable. However, it was impossible to control the degree of catch, and since the operability was low, the hooks and slices could not be separated, and the hitting direction was unstable.

  Therefore, the present invention provides a wood-type golf club having a stable behavior of a golf club head during a swing, capable of controlling the stable return of the head, and excellent in operability and hitting direction. The purpose is to provide.

  In order to solve the above-mentioned problems, in the head of a wood-type golf club having a loft angle of 15 degrees or less, the advance amount of the leading edge of the face surface relative to the shaft axis is FP, and the depth of the center of gravity of the leading edge of the face surface is A wood-type golf club head characterized by satisfying −2 <VZG-2 × FP <2 when a horizontal distance with respect to the vertical direction is VZG, and a wood-type shape having such a wood-type golf club head It is a golf club.

  The FP preferably satisfies 12 mm <FP <20 mm, and more preferably satisfies 12 mm <FP <17 mm.

  According to the present invention as described above, it is possible to bring a stable behavior to the golf club head during the swing, to control the return state of the stable head, and to improve the operability and the hitting direction. It has become possible.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a side view of a wood-type golf club head 1 having a hollow portion 10. A head body 2 is provided with a hosel 3 and a face plate 5 is fixed. A shaft (not shown) is attached to the hosel 3. A wood-type golf club is formed. The loft angle of the wood-type golf club of the present invention is formed to be 15 degrees or less.

  Here, the advance amount of the leading edge 41 of the face surface 4 with respect to the shaft axis S is referred to as FP, that is, face progression, and the horizontal distance with respect to the depth direction of the center of gravity G of the leading edge 41 of the face surface 4 is referred to as VZG. .

  The wood-type golf club head 1 is formed so as to satisfy −2 <VZG-2 × FP <2. The value of FP preferably satisfies 12 mm <FP <20 mm, and more preferably satisfies 12 mm <FP <17 mm. When the FP is 12 mm or less, the head shape becomes uncomfortable, and the head shape becomes too trapped and goes to the left. When the FP is 20 mm or more, even if the behavior stability during the swing is increased, the trap is bad. Because it becomes.

  The value of VZG is set to satisfy the above −2 <VZG−2 × FP <2 according to the value of FP.

  The golf club head 1 is not particularly limited as long as the material and volume are within the range of a normal wood-type head. For example, a material such as titanium alloy or stainless steel can be used, and the volume should be about 350 cc to 500 cc. I can do it.

  When the volume is 400 cc or more, the center-of-gravity distance, which is the distance from the shaft axis S to the center of gravity G when the center of gravity G is connected perpendicularly from the shaft axis S, is preferably 40 mm or less. This is because when the volume is 400 cc or more, the center-of-gravity distance is usually long and the operability is deteriorated, so that the operability can be improved by shortening the center-of-gravity distance.

  Further, when the volume of the golf club head 1 is increased to about 400 cc or more, the hitting sound is increased and the operability feeling and the hit feeling are deteriorated. It is preferable to enhance the operability feeling by increasing the sound attenuation by mounting an effective material such as magnesium or a magnesium alloy on the toe and heel sides of the back face. This alloy member is formed in the shape of a screw 7 and can be mounted by being screwed in the direction of the hollow portion 10 from the concave portion 8 provided in the back face.

  Also, large heads with large volumes tend to get caught automatically, so the thickness of the crown should be increased from the face 4 side to the back face side compared to other head parts. Is preferred. For example, the thickness L of the hosel 3 on the back face side can be set to 0.6 mm, the thickness M on the back face side can be set to 0.7 mm, and the thickness N on the back face side can be set to 1.0 mm. With such a configuration, the trapping performance can be improved.

In the golf club head 1, the head body 2 is made of titanium alloy, the face plate 5 is made of titanium, the volume is 410 cc, and the FP value (mm) and VZG value (mm) are changed. 3. Manufactured as Comparative Examples 1 to 9, golf players actually tested and examined the feeling of trapping, feeling of behavior stability during swing, side spin, launch direction, and trajectory. The results are shown in Table 1. In the table, the unit of FP and VZG-2 × FP is mm, the value of side spin, plus means slice spin, minus (-) means hook spin, and it is clockwise when viewed from above with respect to the flying ball line. The spin is positive, and the counterclockwise spin is negative. The unit of side spin is rpm. Further, the trajectory indicates the amount of left and right blurring with respect to the target direction, and the case where it shifts to the right with respect to the target direction is indicated by a positive value, and the case where it shifts to the left is indicated by a negative (−) numerical value, and its unit is m.

  As shown in the results of Table 1, in the present invention, it can be seen that the golf club head during the swing has a stable behavior and is excellent in operability and hitting direction.

Side view of one embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Golf club head 10 Hollow part 2 Head main body 3 Hosel 4 Face surface 41 Leading edge 5 Face plate 7 Screw FP Face progression VZG Depth of center of gravity G Center of gravity S Shaft axis

Claims (4)

In a wood-type golf club head with a loft angle of 15 degrees or less, when the amount of advance of the leading edge of the face surface relative to the shaft axis is FP, and the horizontal distance of the center of the leading edge of the face surface is VZG,
-2 <VZG-2 × FP <2
A wood-type golf club head characterized by satisfying The FP is
12mm <FP <20mm
The wood-type golf club head according to claim 1, wherein: The FP is
12mm <FP <17mm
The wood-type golf club head according to claim 2, wherein:   A wood-type golf club comprising the wood-type golf club head according to any one of claims 1 to 3.

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