JPH0975485A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a golf club having a sweet spot of expanded elliptical form on the center of a face, and a head designed to transmit maximum energy to the center of a ball. SOLUTION: The actual center of gravity G of a head 1 is set so as to come on the intersection of lines passing through the center of gravity positioned at the center of the upper surface of a head 1, a face 4 and a toe 5, and a distance (a) from the intersection of a line drawn from the actual center of gravity G to the sweet spot of the face 4 with a shaft axial line up to the actual center of gravity G is made equal or approximately equal to a distance (b) from the intersection to the face 4. As a result, even when a ball is hit on an area off the sweet spot, the shaft axial line is subjected to minimum torsion. Thus, moment is transmitted to the center part of a ball without any disturbance and generated energy is maximized, thereby preventing a drop in a carry.

Description

Detailed Description of the Invention

[0001]

The present invention relates to a golf club in which the actual center of gravity is at the center of the head and the center of gravity of the head is in a relative relationship equal to the distance from the axis of the shaft to the face.

[0002]

2. Description of the Related Art Conventionally, golf clubs have undergone many improvements in materials, structures, and the like in order to improve performance such as flight distance, directionality, and ease of hitting. In a golf club called a wood, in the conventional head 1, the center of gravity 7 of the upper surface 3, the face surface 4, and the toe surface 5 is slightly above and to the left as shown in FIG. It is on the upper left side of the surface. The sweet area 9 of this kind of bed has a semicircle upward as shown by the hatched portion in the figure. The line connecting the sweet spot on the face surface and the actual center of gravity of the head (centroid line) is located at the top of the face surface as shown in FIG.
Is displaced from the force received by the center of gravity, the force causes torsion in the direction of arrow A about the center of gravity G. Since the distance a from the shaft axis to the center of gravity G and the distance b from the shaft axis to the face surface are a 面 b, the shaft is twisted in the direction of arrow B. Further, even if the ball 10 is hit at the sweet spot, since a ≠ b, the shaft is similarly twisted in the direction of arrow B. These twists result in a large energy loss and, as a result, affect the flight distance. SUMMARY OF THE INVENTION An object of the present invention is to provide a golf club having a head having a wide elliptical sweet area at the center of the face surface and designed to transmit the maximum energy to the center of the ball.

[0003]

In order to achieve the above object, a golf club according to the present invention according to the first aspect of the present invention is characterized in that the golf club extends from the center of gravity of the head to the sweet spot on the face surface and the point where the shaft axis intersects. The head has a configuration in which the distance to the center of gravity and the distance to the face surface are equal or almost equal. A second aspect of the present invention is the configuration according to the first aspect of the present invention, wherein the center of gravity of the head is set to an intersection passing through the center of gravity located at the center of the upper surface, the face surface, and the toe surface of the head. According to the above configuration, even if the sweet spot is removed, the torsion applied to the axis of the shaft is minimized, so the moment is transmitted to the center of the ball as it is, the energy is maximized, and a decrease in the flight distance can be prevented. it can.

[0004]

Embodiments of the present invention will be described below with reference to the drawings. Note that the same components as those of the conventional golf club are denoted by the same reference numerals, and description thereof will be omitted as appropriate. FIG. 1 shows a configuration of an embodiment of the present invention. A golf club includes a head 1 and a shaft 2 connected to the head 1. The head 1 has an upper surface 3, a face surface 4, a toe surface 5, and a sole surface 6. Since the center of gravity of each of the upper surface 3, the face surface 4, and the toe surface 5 is located at the center, the sweet spot 8 is located at the center of the face surface (real center), and the sweet area 9 is located at the center of the sweet spot 8. Ellipse (hatched part in the figure)
Formed. With such a head structure, a wide sweet area 9 can be obtained.

The actual center of gravity G of the head 1 is located at the intersection of a line passing through the center of gravity located at the center of each of the upper surface 3, the face surface 4, and the toe surface 5. In FIG. 2, the distance a from the point where the line drawn from the actual center of gravity G to the sweet spot on the face surface 4, that is, the line connecting the position of the center of gravity of the face surface intersects with the shaft axis, to the actual center of gravity G and the position of the center of gravity of the face surface Are set so that the distances b to each other are equal (a = b). In the present invention, a = b is an essential requirement, but a ≠ b is also included in the present invention as long as the twist applied to the outer diameter of the shaft is extremely small.

(Embodiment) When the material is a titanium head or carbon shaft, the outer diameter of the tip of the pipe-shaped shaft is usually 8.5 mm or more, and the inner diameter is about 3.5 mm. The axis of the actual shaft is the center line that is adhered to and supported by the head with the outer diameter of the shaft being positive. When the distance from the center of gravity to the sweet spot (depth of center of gravity) is 36 mm, a = b = 18 mm, and the outer diameter of the shaft is 1 mm.
If it is within 0% (8.5 × 0.1 = 0.85 mm), it is estimated that the torsion exerted on the outer diameter of the pipe-shaped shaft is extremely small as shown in the figure. Therefore, ab ≦ 1.7 mm
Then, the twist in the direction B is considered to be extremely small. Therefore, the present invention substantially encompasses a = b (a ≒ b).

Next, the operation of the embodiment of the present invention will be described. Since the center of gravity line coincides with the optimum hitting point at the center of the face surface, and the distance from the shaft axis to the face surface and the center of gravity G is equal or almost equal, so even if the sweet spot is removed, the twist applied to the shaft axis Is minimized, the moment is transmitted to the center of the ball, and the energy is maximized.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a head structure according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram relating to an actual center of gravity and operation of a head according to an embodiment of the present invention.

FIG. 3 is an explanatory diagram of a conventional head structure.

FIG. 4 is an explanatory diagram relating to an actual center of gravity and operation of a conventional head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Head of golf club, 2 ... Shaft, 3 ... Upper surface of head, 4 ... Face surface of head, 5 ... Toe surface of head, 6 ... Sole surface of head, 7 ... Center of gravity, 8 ... Sweet spot, 9 ... Sweet Area, G ... the actual center of gravity of the head

Claims (2)

[Claims] 1. A head having a head in which the distance from the point of intersection of the shaft axis with the line drawn from the center of gravity of the head to the sweet spot on the face surface and the distance from the center of gravity to the face surface is equal or substantially equal. And golf clubs. 2. The golf club according to claim 1, wherein the center of gravity of the head is set at an intersection passing through the center of gravity located at the center of the upper surface, the face surface, and the toe surface of the head.