JPH1157089A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce load applied on the hands of a player during swinging, to stabilize the swing and to reduce fatigue of the player by specifying the torque of a shaft in a golf club having a head with a specified distance of the center of gravity. SOLUTION: When the surroundings of both end parts of a shaft single body are held by means of chucks and a torque of e.g. 13.825 kg.cm is applied on the chuck part 7 of the apex part of a shaft 1 and the rotated angle θ is made as the torque, the shaft 1 is prepd. so as to make the torque larger than 7.0 deg.. A head 5 with a distance of the center of gravity of at least 30 mm is mounted on the shaft 1 like above. To thus form the torque larger than 7.0 deg. is realized e.g. by decreasing the amt. of use of a prepreg sheet prepd. by arranging reinforcing fibers in the oblique direction. When the torque is made too large, since there exists a tendency of hardly perceiving the direction of the face, the max. value is made at most 12 deg..

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club, and more particularly, to a golf club equipped with a so-called large head.

[0002]

2. Description of the Related Art A golf club is shown in FIG.
As shown in (a), a grip 3 and a head 5 are formed on a shaft 1 made of steel or reinforced fiber plastic.
It is configured with attached. In recent years, the head 5 has been increasing in size for the purpose of expanding the sweet area.
When the size of the head increases, it is inevitable that FIG.
The distance from the center of gravity G of the head 5 to the axis S of the shaft, that is, the distance from the center of gravity of the head 5, that is, the so-called center of gravity distance, becomes longer. The moment acting around increases.

[0003] When swinging a golf club, the toe side 5a of the head 5 rotates substantially 90 ° with respect to the plane formed by the shaft 1 during the swing. This will be specifically described with reference to FIGS.

[0004] When swinging a golf club, the golf club moves from the address position to the top position from P1 to P1.
The trajectory indicated by P9 is followed, and from the top position to the impact position, the trajectory indicated by P9 to P1 is followed. FIG. 3A shows a state in which the top position is reached during a swing. When such a swing state is viewed from the direction of the arrow, the swing of the shaft 1 is as shown in FIG. In the plane P.

In FIG. 3B, the dotted line shows the state of the head 5 at the time of addressing, and the solid line shows the state of the head 5 at the top position. As is apparent from this figure, from the address to the top (backswing), as shown by the solid arrow, the head 5 moves approximately 9 degrees with respect to the plane P formed by the shaft during the swing.
From the top to the impact (down swing), the head 5 rotates by approximately 90 ° with respect to the plane P formed by the shaft during the swing, as shown by the dotted arrow. That is, the toe side of the head 5 is located at an address position, a top position, with respect to a plane P formed by the shaft during the swing.
90 °… 0 over the impact position of the downswing
° ... rotate in the direction of 90 °.

[0006] By rotating the toe side of the head in this manner, the change in the angular acceleration of the rotation of the head about the axis of the shaft 1 sharply increases in the top turning region from the back swing to the down swing.

[0007] Therefore, when swinging from the address position, a load in the rotational direction of twisting the wrist acts on the hand gripping the shaft in addition to the load in the moving direction of the shaft. From the latter half to the first half of the downswing, a large load is suddenly applied to the player's hand, centering on the top turning area. If such a sudden load is applied to the hand during the swing, the swing is broken, making it difficult to take timing, causing a problem that the direction of the hit ball is not stable and the flight distance does not increase. In addition, such a load causes a problem that the arm and shoulders are hurt, especially at the wrist, and that the player tends to be tired when playing for a long time.

In particular, conventional golf club shafts are:
In the case of steel, when the torque is measured by a measuring method described later, the torque is about 2 ° to 3 °. In the case of the reinforced fiber plastic, the torque is 2 ° to Since it is designed to be 3 ° or less, there is a characteristic that it is hard to rotate against the torsion in the rotation direction as described above. Therefore, in a conventional golf club, the larger the head is, the greater the load on the player's hand is, and the above-described problem becomes remarkable.

The present invention has been made by focusing on the fact that if the head is enlarged in order to enlarge the sweet area, the above-described problem will occur. That is, the present invention provides a golf club capable of reducing the load on a player's hand during a swing even if the head is enlarged, thereby stabilizing the swing and reducing the fatigue of the player. Aim.

[0010]

According to the present invention, there is provided a golf club having a head having a center of gravity distance of 30 mm or more.
The angle is larger than °.

Here, a method of measuring the above-mentioned torque will be described with reference to FIG. First, the grip 3, the head 5, and the socket 6 are removed from the shaft 1 to make the shaft alone. Next, chucking is performed from the base end of the shaft to a position of 173 mm, and from the distal end of the shaft to a position corresponding to the neck end surface of the head (a range indicated by L). Then, when a torque of 13.825 kg · cm is applied to the chuck portion 7 at the tip of the shaft, the shaft is rotated from the direction shown by the arrow as shown in FIGS. θ is the torque defined in the present invention. By setting the torque to a large value in this way, a golf club having such characteristics that a large load is applied in a short time but a small load is applied in a long time is obtained.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION The golf club of the present invention forms a shaft such that the torque is greater than 7.0 ° when the torque is measured by the above-described measuring method. And a head having a center of gravity distance of 30 mm or more.

[0013] Of the above-mentioned shafts, a shaft made of a reinforced fiber plastic is usually prepared by arranging reinforcing fibers in one direction, impregnating a synthetic resin with the fibers, winding a so-called prepreg sheet around a core metal, and heat-curing. , Decentering, painting, polishing and the like. Such a shaft is a prepreg sheet in which reinforcing fibers are aligned in the axial direction, those in the circumferential direction, and reinforcing fibers are inclined (preferably 45 °) with respect to the axial direction. Alignment is performed by stacking the alignment so that the alignment directions cross each other, and these are formed by winding an arbitrary number of plies. In this case, the strength in the torsion direction of the shaft can be obtained by winding a prepreg sheet wound around the core metal in which the reinforcing fibers are aligned obliquely to the axial direction as described above. Can be.

As described above, the shaft of the golf club of the present invention is configured so that the torque is greater than 7.0 °. This is because, for example, the above-described reinforcing fibers are obliquely aligned. This can be realized by reducing the amount of the prepreg sheet used, using a prepreg sheet in which the alignment direction of the reinforcing fibers is close to the axial direction, or changing the type of the reinforcing fibers or synthetic resin used. .

Actually, the torque to be set is preferably 8.0 ° or more in consideration of the fact that the center of gravity distance of a recent titanium-based large head is generally 34 mm or more. Further, if the torque is too large, the direction of the face tends to be difficult to be sensed. Therefore, the maximum value is preferably set to 12 ° or less. In the case of a ladies' shaft, since it is inferior to a male in terms of physical strength, it should be at least 8.0 °, preferably in the range of 8.0 ° to 13.0 °.

A so-called large head is mounted on such a shaft.
The distance of the center of gravity is 30mm or more, or the head weight x
The distance of the center of gravity is 6000 g · mm or more, and other configurations are not limited.

According to the golf club constructed as described above, in addition to the load in the moving direction of the shaft and the load in the direction of twisting the wrist due to the rotation of the head, the torque of the shaft is made larger than in the prior art. Can be alleviated. That is, such a load is effectively alleviated during the swing, particularly in the top turning region where a large load is applied, so that the swing can be stabilized, the head speed can be improved, and the hitting direction can be stabilized. Also, without hurting the wrists, arms, and shoulders, the player will not be tired of playing for a long time.

[0018]

According to the golf club of the present invention, since the torque of the shaft is set to be larger than that of the conventional golf club, the rotation direction applied to the player's hand during a series of swings from the address to the backswing and downswing is performed. Can be reduced, and the swing can be stabilized. Also, since such a load is effectively reduced,
You won't get tired after playing for a long time without hurting your wrists, arms and shoulders.

[Brief description of the drawings]

FIG. 1A is a diagram showing an overall configuration of a golf club;
(B) is a diagram showing the distance of the center of gravity of the head.

FIG. 2 is a diagram showing a trajectory when a golf club swings.

3A is a diagram showing a state in which the golf club is held at a top position, and FIG. 3B is a diagram of FIG. 3A as viewed from the direction of an arrow, showing a locus, an address position, and a top position of a shaft. FIG. 4 is a diagram showing a state of the head in FIG.

4A and 4B are diagrams showing a method of measuring torque, and FIG.
The figure which shows the state which removed the head and the grip from the golf club, and chucked. (B) is 13.825 kg
The figure which looked at the shaft before giving the torque of cm from the axial direction, and the figure which looked at the shaft at the time of giving the said torque from the axial direction, and (c).

[Explanation of symbols]

 1 Shaft 3 Grip 5 Head 6 Socket

Claims (1)

[Claims] 1. A golf club having a head having a center of gravity distance of 30 mm or more has a shaft torque of 7.0.
A golf club characterized by being larger than °.