JPH065652U - Metal wood type golf club head - Google Patents

Abstract

(57) [Summary] [Structure] The back side 7 is removed from the general wood shape. It is a hollow flat type having a back wall portion 2 which is curved concavely when seen in a plan view. [Effect] The depth of the center of gravity can be shallow. As a result, the height of the sweet spot is lowered, the backspin is suppressed, and the flight distance of the ball is extended.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a metal wood type golf club head.

[0002]

[Prior art]

 A so-called "metal wood" metal golf club head a is composed of a hollow metal shell body having a convex curved surface as a whole as shown in FIG.

In FIG. 5, the distance between the point d where the line drawn from the center of gravity g of the head parallel to the sole b intersects the face surface c and the center of gravity g of the head is called the center of gravity depth B. It is generally said that in "Metalwood", the depth of the center of gravity is shallow, and the height H of the sweet spot S is lowered correspondingly, so that the backspin is suppressed and the flight distance is extended.

As compared with other heads made of wood or FRP, the reason why the depth of the center of gravity B is shallow is that in “metal wood”, the thickness of the face surface c is larger than that of other parts, and the overall shape is different. This is because it is smaller than those made of wood and FRP.

[0005]

[Problems to be solved by the device]

 By the way, recently, there is a demand to further reduce the depth of the center of gravity.

However, if the depth of the center of gravity is to be further reduced with the general wood shape, it is necessary to further reduce the head as a whole, which makes the golfer's psychology uneasy and the ball has a face. There is a problem that the probability of hitting the surface is also low.

Further, a method of further increasing the wall thickness of the face surface without changing the shape, size, etc. of the golf club head causes a problem in strength because the wall thickness of other portions is extremely thin. .

An object of the present invention is to reduce the depth of the center of gravity without causing any psychological anxiety that the golf club head is small when a golfer holds the golf club, and does not cause a problem in strength of the golf club head. A metal hollow wood type golf club head is provided.

[0009]

[Means for Solving the Problems]

 The present invention is a hollow flat type having a back surface removed from a general wood shape and having a back wall portion that is curved and concave in plan view.

[0010]

[Action]

 Since the back side is removed from the general wood shape, the general wood shape remains for the face surface, heel side curved surface, and toe side curved surface. Do not give the golfer the feeling that something is wrong with the address being normal and the head being small (thin).

[0011] Since the hollow flat type is provided by providing a curved back surface wall portion in a plan view (while the sole surface is kept horizontal), the depth of the center of gravity can be made sufficiently shallow. The height of the sweet spot goes down.

[0012]

【Example】

 The present invention will be described below based on the illustrated embodiments.

1 and 2 are plan views showing an embodiment of a metal wood type golf club head according to the present invention, and FIG. 3 is a sectional view taken along the line YY of FIG.

The conventional, generally wood-shaped back side 7 shown by the two-dot chain line in FIG. 1 is removed, and a curved back wall portion 2 is provided in plan view (as indicated by the solid line). However, in the present proposal, “in a plan view” means that the sole surface 10 is held horizontally and viewed vertically downward.

In this way, the overall shape of the golf club head is a hollow flat type.

More specifically, as shown in the simplified sectional view of FIG. 4, the sole surface 10 is kept horizontal and has a predetermined radius of curvature R in plan view and the heel side to the toe side. Looking at, the back wall portion 2 is formed on the curved concave curved surface showing the vertical straight line C to form a hollow flat mold.

By the way, the face surface 1, the heel-side curved surface 4, and the toe-side curved surface 5 are kept the same as those of the general wood shape (from the conventional art) ---- as they are.

In FIG. 2, however, the length A from the end E of the sole portion at the center of the face to the most recessed portion F of the back surface wall portion 2 is 2 to 5 times (preferably the face progression P). 2 to 3 times). If it is less than 2 × P, the head becomes wobbled and becomes unstable at a normal address. On the other hand, when the depth exceeds 5 × P, the depth B of the center of gravity (see FIG. 3) remains unchanged from the conventional one.

The face progression P is the distance from the axis 8 of the shaft 3 to the sole end E of the face center.

Since the surface area is smaller than the conventional general wood shape, it is possible to increase the wall thickness of the golf club head of the present invention (for the same weight). Therefore, in FIG. 3, it is desirable to increase the wall thickness T of the face surface 1 by 5% to 30% as compared with the conventional general wood shape. By doing so, the depth of the center of gravity becomes shallower and the strength of the face surface 1 is improved.

As shown by the broken line in FIG. 4, the curved surface of the back surface wall portion 2 may be formed into a curved convex shape or a curved concave shape as viewed from the heel to the toe side.

Comparing FIG. 3 showing the golf club head according to the present invention with FIG. 5 showing the conventional general wood club head, the depth of the center of gravity B becomes sufficiently shallow in the present invention, and accordingly. It can be seen that the height H of the sweet spot S decreases (decreases). The center of gravity is indicated by G in FIG.

A hollow flat club head having a shape shown by a solid line in FIG. 1 was actually manufactured by a lost wax manufacturing method, and a conventional club head (metal wood) shown by a two-dot chain line in FIG. ─In particular, we compared the depth of center of gravity B, the height H of the sweet spot, and so on. The results are shown in Table 1 below.

[0024]

[Table 1]

From Table 1 above, the product of the present invention was able to reduce the depth of center of gravity B by 23% and the height H of the sweet spot by 21% compared to the conventional product.

[0026]

[Effect of device]

 The present invention has the following significant practical effects due to the above configuration.

The depth of the center of gravity B becomes shallower, the height H of the sweet spot S is lowered correspondingly, the backspin of the hit golf ball is suppressed, and the flight distance is further extended.

At the time of normal address, a general wood shape can be imagined and there is no discomfort that the head is flat.

The thickness T of the face surface 1 can be increased while maintaining the same golf club head weight as the conventional one. As a result, the depth B of the center of gravity can be further reduced, and the strength of the face surface 1 can be improved.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention and for comparison with a conventional example.

FIG. 2 is an explanatory view of the present invention.

3 is a sectional view taken along the line YY of FIG.

FIG. 4 is a simplified cross-sectional explanatory diagram.

FIG. 5 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Face surface 2 Back wall 7 Back side B Center of gravity depth

Claims (1)

[Scope of utility model registration request] 1. A back wall portion 2 having a shape in which a back side 7 is removed from a general wood shape and having a curved concave shape when seen in a plan view.
A metal wood-type golf club head, which is a hollow flat type having: