JP2001009069A - Head of golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make a face thinner, the weight per unit volume smaller, rigidity higher, the carry of a ball longer and a head hardly breakable. SOLUTION: The head is formed as a hollow body 7 having the face 6 and the thickness of the face 6 is made different from the thicknesses of a sweat area 8 and other portions 9. The thickness of the sweat area 8 is made smaller than the thickness of the other portions 9. A rust preventive coating is applied on the surface of the body 7 and the portions of score lines 16 (16a to 16h) of a coating deposition layer 15 disposed at the face 6 are made thin and the other portions thick. The score lines 16 are formed by differences in the thicknesses of the coating deposition layer 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf club head such as a driver.

[0002]

2. Description of the Related Art Conventionally, a head of a wood, which is a golf club for a flight distance, is made of a titanium alloy or the like, and a hollow body having a face of the head is manufactured by a forging method or the like to secure a necessary volume, Is used lightly. Improvements are being made in the direction of increasing the flight distance of the ball by making the face as thin as possible. Further, as shown in FIG. 4, a plurality of parallel grooves called score lines 2 are distributed and arranged at equal intervals, for example, eight in the face 1.
In addition, when the score line 2 is applied, a method of shaving a material from the plane of the face 1 by mechanical engraving to form a groove is adopted in addition to a casting method. In the former case, the idea is to increase the repulsion force by increasing the vibration coefficient by thinning the face to extend the flight distance, and in the latter case, to extend the flight distance by giving the ball backspin in the groove and increasing the flight time. Based on In the figure, 3 is a body, and 4 is an internal space. The body 3 is thinner at the other parts than at the face 1.

[0003]

However, if the face 1 is made thinner, and a groove is formed or carved in the thin face 1 to form the score line 2, there is a problem because the head is easily damaged. Note that the maximum groove depth is 0.5 mm and the maximum groove width is 0.9 mm according to the rules.
Therefore, adjacent flat surfaces having a width of at least three times the groove width are required.

The present invention has been made in view of such conventional problems. The face is made thinner, the weight per unit volume is reduced, the rigidity is increased, the flight distance of the ball is increased, and the ball is damaged. It is an object to provide a golf club head which is difficult.

[0005]

To achieve the above object, a golf club head according to the present invention uses a hollow body having a face. Then, the thickness of the face is made different between the sweet area and the other parts, and the thickness of the sweet area is made smaller than the thickness of the other parts.

Further, the surface of the body is coated with anti-corrosion paint, and the coating layer provided on the face is thinned at the score line portion.
It is preferable that the other portions are made thick and score lines are formed according to the difference in the thickness of the coating layer.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the attached FIGS. FIG. 1 is a sectional view of a main part of a driver head to which the present invention is applied, FIG. 2 is a partially enlarged view thereof, and FIG. 3 is a front view thereof. In manufacturing the head 5, a hollow body 7 having a face 6 is formed by forging using a titanium alloy or the like as a material. At that time, face 6
The thickness of the sweet area 8 is made different from the thickness of the sweet area 8 most suitable for hitting the ball, and the thickness of the other area 9 is made smaller than the thickness of the other area 9. For example, as shown by the dotted line in FIG. 2, the back surface of the central portion near the lower side corresponding to the sweet area 8 of the face 6 is cut into a trapezoidal shape having a longer upper side and a shorter bottom side to form the recess 10. Then, the thickness of the sweet area 8 is set to 2.7 mm, and the thickness of the other portion 9 surrounding the sweet area 8 is set to 3 mm. However, the thickness of the sweet area 8 can be further reduced, and may be 2.2 mm.
In addition, the thickness of the face is conventionally made uniform, and 3.0 to 3.3.
mm.

When the thickness of the face 6 is reduced in this way, and especially when the thickness of the sweet area 8 is made thinner than the thickness of the other portions 9, the vibration coefficient of the sweet area 8 can be increased. Therefore, the repulsive force of the sweet area 8 increases and the flight distance increases. Further, the weight per unit volume can be reduced and the weight can be reduced. Moreover, the sweet area 8 which was thinned
Can be supported by the other thick part 9 around it, the rigidity is increased, and the head 5 is hardly damaged. Reference numeral 11 denotes an internal space of the body 7.

Next, the surface of the body 7 is coated with a rust-proof coating in order.
Apply repeatedly. First, as an undercoat clear paint for the first coating, for example, 48% of synthetic resins such as polyester resin, melamine resin, epoxy resin and the like, and alcohols, acetates, glycol ethers, aromatic hydrocarbons, etc. A synthetic resin paint containing 52% of solvents is used. And
A thin paint is sprayed on the entire surface of the body 7 to a certain thickness, and a thin first coating layer 12 having a thickness of several μm, for example, 2.5 μm is formed on the face 6. Next, a synthetic resin paint containing a pigment is used as the paint for the second coating. This coating material is prepared by adding pigments such as carbon black and aluminum powder and auxiliaries to the above-mentioned synthetic resins and solvents in order to easily form the thickness of the coating layer. 3.95%, synthetic resins 47.12%, auxiliaries 0.3%, and solvents 48.63%. The above percentages are all percentages by weight.

[0010] Then, on the thin first coating layer 12 of the body 7, a thick layer having a certain thickness, for example, several tens μm, for example, 20
A second coating layer 13 of μm is formed. At that time, face 6
Is applied to the first coating layer 12 on the face 6 by using a grid-like tool (not shown). Then, the paint does not adhere to the score line forming portion of the face 6, and a thick second coating layer 13 can be formed on the other first coating layer 12. Next, as the top clear coating for the third coating,
The second coating layer 1 of the body 7 using the paint used for
3 and a portion of the face 6 where the score line is to be formed, a thin paint is sprayed on the first coating layer 12 to a certain thickness on the first coating layer 12 to form a thin third coating layer 14 having a thickness of several μm, for example, 2.5 μm. .

In this manner, the score line portion of the face 6 has a 5 μm-thick laminated structure in which the thin first and third coating layers 12 and 14 are overlapped, and the other portions have the thick coating layer 13 thin. Thickness 25 interposed between coating layers 12 and 14
A layered structure of μm is formed. Then, JGA (JAPAN
A coating layer 1 having a laminated structure on the entire surface of the body 7 so as not to violate GOLF ASSOCIATION rules.
5 and the coating layer 15 covering the face 6 is provided with a difference in thickness, and the U-shaped grooves are arranged at equal intervals in a distributed manner, so that eight parallel score lines 16 (16a,...) 16h) can be easily formed. These score lines 16
The depth of each groove for forming is equal to the thickness of the second coating layer 13 and is 20 μm, but the edge of each groove is rounded. At that time, there is a restriction by rules, and if the edge of each groove is sharpened, the backspin becomes too large, so that the edge must be rounded with a radius of 0.5 mm or more. The cross-sectional shape of each groove may be V-shaped or inverted trapezoidal.

The coating layer 15 having such a laminated structure
When the entire surface of the body 7 is covered, the score line grooves need not be formed by scraping the face 6 or the like as in the related art, and the strength of the body 7 can be maintained and the rigidity can be increased. Therefore, the thickness of the face 6 can be further reduced,
Rust, breakage and the like are prevented from occurring, and the head 5 can be given an aesthetic appearance. In addition, the thick second coating layer 13 containing the pigment is reinforced by being sandwiched between the thin first and third coating layers 12 and 14, and the strength of the coating layer 15 having a laminated structure can be increased. .

The moment of inertia indicating the performance of the head 5 is defined by an axis 18 perpendicular to the ground passing through the center of gravity 17 of the head 5.
, The moment of inertia in the direction of the arrow about the axis 19 horizontal to the ground passing through the center of gravity of the head 5 and the like. In addition, the sweet area 8 becomes wider as the head 5 is made larger by using a material having a low specific gravity such as a titanium alloy or duralumin and a high strength for the head 5, and the moment of inertia becomes larger as the sweet area 8 is made wider. . The larger the moment of inertia of the head 5 is, the more the head 5 continues to move even if the ball deviates from the center of the face 6 when hitting the ball. Since the loss is small, the flight distance is extended without variation in directionality.

In the above-described embodiment, the first and third coating layers 12 and 14 which are thin only on the score line 16 of the face 6 constituting the body 7 have a laminated structure.
The other part of the body 7 has a laminated structure in which the thick second coating layer 13 is interposed between the thin first and third coating layers 12 and 14, but the first coating layer 12 is not provided and the face 6 Of the body 7 is covered with the thin second coating layer 13 and the thin third coating layer 14, and the other portions of the body 7 are covered with the respective score lines 16. It can also be formed. Since the periphery of the score line 16 is protected by the second and third coating layers 13 and 14 each having a thickness of 25 μm, even if only the thin third coating layer 14 having a thickness of 2.5 μm is used, the impact resistance is improved. Excellent effect on rust prevention and the like.

Further, in the above embodiment, the coating layer 15 of the face 6 constituting the body 7 is formed from the thick second coating layer 13 and at least the third coating layer 14, and Is provided with at least a thin third coating layer 14, and provided with a thick second coating layer 13 and at least a thin third coating layer 14 in other parts of the body 7. The line 16 was formed, but a uniform coating layer (not shown) was provided on the face 6 and the coating layer was subjected to chemical treatment, thermal treatment, mechanical engraving, etc. Is thin, the other parts are thick,
The score line 16 can be formed by the difference in the thickness of the coating layer.

[0016]

According to the present invention described above, claim 1
In the described invention, the thickness of the face is made different between the sweet area and the other parts, and the thickness of the sweet area is made smaller than the thickness of the other parts, so that the vibration coefficient of the sweet area most suitable for hitting the ball is obtained. It can increase the rebound and increase the flight distance. Then, the weight per unit volume is small, and the weight of the head can be reduced. or,
Since the thin sweet area can be supported by other thick parts around the thin sweet area, the rigidity is increased and the head is hardly damaged.

According to the second aspect of the present invention, the surface of the body is provided with a rust-preventive coating, and the score line portion of the coating layer provided on the face is made thin and the other portions are made thick to form the score line. Therefore, the score line can be formed by the coating layer covering the face. Therefore, it is not necessary to scrape the thin face for forming the score line, and the strength of the body can be maintained. In addition, the face, especially the sweet area, can be further thinned.

[Brief description of the drawings]

FIG. 1 is a sectional view of a main part of a driver head to which the present invention is applied.

FIG. 2 is a partially enlarged view of a main part cross-sectional view of the driver head shown in FIG. 1;

FIG. 3 is a front view of the driver head.

FIG. 4 is a sectional view of a main part of a conventional driver head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 5 ... Head 6 ... Face 7 ... Body 8 ... Sweet area 9 ... Other parts 10 ... Recess 11 ... Internal space 12 ... Thin 1st coating layer 13 ... Thick 2nd coating layer 1
4: Thin third coating layer 15: Coating layer 1 having a laminated structure 1
6 ... Score line

Claims (2)

[Claims] 1. A golf club head comprising a hollow body having a face, wherein the thickness of the face is made different between the sweet area and other parts, and the thickness of the sweet area is made smaller than the thickness of other parts. Characteristic golf club head. 2. The surface of the body is subjected to rust-preventive coating, and the score line portion of the coating layer provided on the face is made thinner, and the other portions are made thicker. The score line is formed by the difference in the thickness of the coating layer. The golf club head according to claim 1, wherein: