JP2001000593A - Golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To substantially prevent the occurrence of a geometric distortion in directivity and to expect an increase in a carry by sealing no-chlorine-base cutting fluid into a hollow part of a golf club which is made hollow over the entire part in a head movably over the entire part of the rear surface of a clubface. SOLUTION: The no-chlorine-base cutting fluid (liquid a) is sealed movably over the entire part on the rear surface of the club face into the hollow part of the golf club which is made hollow over the entire part in the head. The no-chlorine-base cutting fluid prevents the generation of rust by chlorine and does not damage a blank. The liquid (a) gathered at the rear part of the head at the time of the top of a swing collides explosively and intensively at a time in the form of the mass of energy against the rear surface of the face at the time of an impact. To this energy, the effects of a head speed, centrifugal force and heavy acceleration are added. Such effect is resulted from the application of the principle that when a ball on a thin iron sheet is struck by a hammer from below, the ball jumps up and down, i.e., the force generated by the liquid (a) in the head which hinders inertia moment when the face strikes the ball accelerates the head speed and increases the carry.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club having a hollow head and a head made of a lightweight metal.

[0002]

2. Description of the Related Art In a conventional golf club, a sweet spot at which a flight distance can be maximized when hit is limited to a part of a face. Further, there has been a golf club in which a liquid or solid is partially filled in the head so as to affect only a conventional sweet spot.

[0003]

In order to widen the sweet spot, it is said that it is better to increase the depth of the center of gravity of the head (it is said that the depth is greater as going inward from the face), and the peripheral weight distribution has been taken. . That is, the peripheral weight distribution is adopted also for the cavity back iron, hollow metal wood and carbon wood. It has been desired to develop a further club capable of increasing the depth of the center of gravity, enabling the distribution of the peripheral weight, and utilizing the moment of inertia.

[0004]

In order to solve the above-mentioned problems, a golf club according to the present invention comprises a golf club having a hollow head as a whole, wherein a chlorine-free cutting oil is filled in the hollow portion, and a back surface of the face is provided. The gist is that it is movably enclosed throughout.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention can be applied to any type of golf club having a hollow portion formed in a head. Further, the liquid to be sealed in the hollow may be any liquid as long as it is an antifreeze, nonvolatile and flame-retardant liquid, and particularly preferable is a chlorine-free cutting oil shown in the embodiment. This is preferable from the viewpoint of rust generation and corrosion. The volume of the hollow portion is preferably as large as possible because the center of gravity is moved by the movement of the liquid and the liquid impulse from the back of the face is used. In particular, it is preferable that a hollow space is formed on the entire back surface of the face.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A golf club according to the present invention will be described with reference to the drawings. FIG. 1 is a diagram showing the movement of the liquid in the head from the time of top to the time of impact through a downswing. FIG. 2 is a front view of the head of the present invention, and is an explanatory view for comparison with a conventional sweet spot. FIG. 3 is an overall view of the present invention. FIG. 4 is a bottom perspective view of the head of the present invention.

1 to 4, (1) is a head body of the present invention, (2) is a club shaft of the present invention, and (3)
Is a grip of the present invention, (4) is a sweet spot of the present invention, (5) is a normal sweet spot, (6) is a balance position of the present invention, (7) is a normal driver's balance position, and (8) is a normal driver's balance position. Sole (bottom plate), (9) Brass weight (brass weight), (a) Liquid position in head at top, (b) Liquid position in head at downswing, (c) This is the liquid position in the head at the time of impact.

The head (1) of the golf club of the present invention is made of a lightweight metal such as pure aluminum as a hollow material, and the head has a volume of 250 cc. Slide cut NB13 (trade name) having the following properties in the hollow portion
Is enclosed.

[Table 1] This liquid prevents rust from being generated by chlorine and does not damage the material.
Any of the properties of N-B11 to N-B30 are preferable. A brass weight (9) is screwed behind the sole (8) (FIG. 4) to keep the head at a low center of gravity and a deep center of gravity. The shaft (2) is made of ultra-light carbon, and the grip (3) is made of ultra-light rubber. By adopting an ultra-light shaft and grip and concentrating the weight on the head, the club has a lighter weight of 298g, but the balance position of the club is closer to the head side than the normal balance (Fig. 3). This balance is based on the principle of placing a heavy object at the tip as seen on a hammer,
The aim is to get great power with little power.

At the time of impact, the liquid (a) collected at the rear of the head at the time of topping collides with the explosive energy mass on the back of the face at a stretch (c). The energy reaches about one ton or more due to the effects of head speed, centrifugal force and heavy acceleration. This is an application of the principle that when a ball is placed on a thin iron plate and hit with a hammer from below, the ball jumps.The moment the face hits the ball, the force generated by the liquid in the head hindering its moment of inertia However, the flying distance is increased by accelerating the head speed and acting on the ball. Further, in the case of a head having a hollow structure, the face also functions as a spring, so that the face is bent inward by a load generated at the moment of collision with the ball. Although the restoring force of the deflection affects the flight distance of the hit ball, the liquid that has crashed into the back surface of the face has a function of increasing the restoring force of the deflection of the face.

In the above-described embodiment, only the wood type is shown, but the appearance is not limited to this. The present invention is equally applicable to other types of club heads having a hollow structure.

[0011]

Since the liquid collects at the rear of the head at the start of the downswing, that is, at the time of the top (a), the peripheral weight distribution is realized more than in the conventional head, and the sweet spot is widened. While maintaining that state (b), at the moment of the impact, that is, immediately before the end of the downswing, the liquid is biased toward the lower end of the head farthest from the person swinging by the action of the centrifugal force (c), and the drawball comes out. The likelihood increases. As a result, the number of runs after hitting the ball increases, which contributes to an increase in the flight distance.

Further, in the case of a conventional club, the position of the center of gravity of the club itself is determined, and unless the player swings in accordance with the center of gravity, the force cannot be properly transmitted to the ball. However, in this club, the position of the center of gravity of the club can be changed according to the swinging person by moving the liquid part, the liquid gathers at the optimum center of gravity of the swinging person, favorable force transmission can be performed, and accurate hitting can be performed. It becomes possible.

Accordingly, the conventional sweet spot has only a ball-sized area, but the sweet spot of the golf club of the present invention covers almost the entire face (FIG. 2). Also, due to the above-mentioned peripheral weight distribution and centrifugal force, the point that the liquid gathered at the time of downswing becomes a deep center of gravity, and the point that the liquid in the head acts on the entire back surface of the face also contributes to the sweet spot expansion. (FIG. 1). Therefore, even if the ball hits near the toe or heel of the face, the face surface is not lost, but is firmly corrected with the liquid, the directionality is hardly disturbed, and the flight distance can be expected to be increased.

The difference in flight distance when the present invention was compared with the case where the liquid was not sealed was measured under the following conditions. All measurements were carried, the head speed was 38 m / sec, the slice wind was about 1 m, the weather was fine, and the balance, weight, and shaft hardness of the test driver when liquid was filled and when not filled were all unified. Results were obtained.

[Table 2]

From the above, it was found that the use of the golf club of the present invention showed a difference in flight distance of about 10 yards on average. This time, for the purpose of accuracy, we did not measure the run distance of the run depending on the condition of the fairway, but we think that if the difference is 10 yards with a normal carry, the total difference will be more than 20 yards in total Be

[Brief description of the drawings]

FIG. 1 is a diagram showing the movement of the liquid in a head from a top time to an impact through a downswing.

FIG. 2 is a front view of a head according to the present invention, and is an explanatory view for comparison with a conventional sweet spot.

FIG. 3 is an overall view of the present invention.

FIG. 4 is a bottom perspective view of the head of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 The head part of this invention 2 The shaft part of this invention 3 The grip part of this invention 4 The figure which shows the sweet spot of this invention 5 The figure which shows the normal sweet spot 6 The balance position of this invention 7 The normal balance position 8 This invention Sole portion 9 Brass weight a Liquid position in head at top b Liquid position in head at downswing c Liquid position in head at impact

Claims (1)

[Claims] 1. A golf club in which the entire inside of a head is hollow, wherein chlorine-free cutting oil is movably sealed in the hollow portion on the entire back surface of the face.