JP2002331053A - Putter for golf - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a putter for golf having high strength and excellent restitution characteristics, and enabling obtaining of good striking feeling. SOLUTION: A head 2 linked to a lower end of a shaft 1 is composed of an bamboo glued laminate 3, wherein a core material (lead) 4 is inserted inside. A recessed part 5 is formed in a center part of a back face of the head 2, and a thickness of the front face of the head 2 is 8 mm. The head 2 is integrally formed by laminating and adhering six plate-like bamboo pieces 11-16, wherein a curved face of an outer surface of the bamboo is used as it is for a face plate 19 so that bamboo fiber density becomes lower from the surface of the head 2 toward an inside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a golf putter having an improved hitting feel, and more particularly to a golf putter in which a head portion of the golf putter is made of laminated bamboo.

[0002]

2. Description of the Related Art A golf putter includes a shaft having a grip portion at an upper end and a head connected to a lower end of the shaft. The head portion is usually made of metal or wood. JP-A-4-4096
Japanese Patent Application Laid-Open No. 9-206412 and Japanese Patent Application Laid-Open No. 9-206412 disclose that the head is made of a laminated material made of metal or non-metal to enhance durability and to form a digit pattern or a stripe pattern on the head surface. There is disclosed a device that creates a sense of quality.

[0003]

However, although the club head having the conventional structure has a high strength, the hardness of the material itself is high and the elastic repulsive force against the ball is low, so that the hit feeling when hitting the ball is hard. There is a disadvantage that it is. To eliminate this drawback, the head may be formed from a thin plate material.However, if the head is formed from a thin plate material, there is another problem that the strength is reduced and the swing speed of the head is reduced. appear.

Japanese Patent Application Laid-Open Nos. 62-281979 and 62-281980 disclose a structure in which bamboo is used as a material for a shaft or a head.
In these products, the fan-shaped core material is arranged in a circular shape, so that the appearance can be improved without causing warpage. However, since the head is hard and the elastic repulsive force against the ball is weak, it is hit. There is a problem that feeling is not good. SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems of the related art, and has as its object to provide a golf putter that can obtain a good hit feeling without reducing head strength and head swing speed. Is to do.

[0005]

Therefore, in the golf putter of the present invention, the club head is formed of a bamboo laminated material, and a core material is buried inside the laminated material. The first feature is that a plurality of plate-shaped bamboo pieces are laminated and adhered so that the fiber density of the above becomes coarser and denser than the fiber density on the outer surface side. In addition, the fact that the outer curved surface of bamboo was used on the face of the head
The feature of. Here, as the bamboo pieces, the inner part and the outer part of a natural bamboo tube are cut into a plate shape, and the inner bamboo pieces and the outer bamboo pieces are alternately stuck and connected to prevent warpage of the laminated wood. It is planned.

The laminated bamboo is manufactured by stacking a plurality of plate-shaped bamboo pieces and integrally laminating them, and each bamboo piece is set to a thickness of 3 to 5 mm. This bamboo piece is obtained by radially dividing a bamboo cylinder into a plate shape. In this case, the inside part and the outside part of the bamboo tube are vertically stripped. When producing the glued laminated lumber, inner bamboo pieces and outer bamboo pieces having a predetermined thickness are alternately arranged and superposed and adhered. In this way, the laminated wood is less likely to warp even after long-term use, and the roughness of the material density can be changed between the inner surface portion and the outer surface portion. A hole such as a core material is buried in the interior of the laminated wood, and a face member using the outer curved surface of the bamboo as it is is attached to the outer surface of the laminated wood.

The outer surface of bamboo used for the face member has a gradually increasing fiber density from the surface to the inner surface. For this reason, when the ball is hit, the impact from the ball can be promptly absorbed by the fiber dense portion on the inner surface side. As a result, the hit feeling becomes soft, and the rolling of the ball becomes good.

[0008]

Embodiments of the present invention will be described below with reference to embodiments shown in the drawings. The laminated wood according to the present embodiment uses inner bamboo pieces and outer bamboo pieces obtained by cutting the inner part and outer part of the bamboo tube into a plate shape, and a plurality of inner bamboo pieces and outer bamboo pieces are alternately polymerized and laminated, and the laminated wood The fiber density in the inner part is made coarser and denser than the surface part.

FIG. 1 is a partially cutaway perspective view showing a head portion of a golf putter according to the present invention, FIG. 2 is a perspective view showing a laminated material which is a material of the head portion, and FIG. 3 is used for the laminated material shown in FIG. FIG. 4 is a perspective view of FIG. 3, FIG. 5 is a plan view illustrating a state in which the bamboo cylinder of FIG. 3 is divided and formed into a plate material, and FIG. 7, FIG. 7 is a perspective view of FIG. 6, FIG. 8 is a partially cutaway front view showing a state in which a shaft is attached to a head, FIG. 9 is a partially sectional rear view of FIG. 10 is a plan view showing a partial cross section of FIG. 8, FIG. 11 is a plan view showing a state in which a face is attached to a head, FIG. 12 is a plan view of a main part explaining a cut-out portion of a face plate of a bamboo cylinder, and FIG. FIG. 14 is a plan view of a main part for explaining the density, FIG. 14 is a front view of the head, and FIG.
14A is a sectional view taken along line AA of FIG. 14, and FIG.
14 is a sectional view taken along line B, and FIG. 14C is a sectional view taken along line CC in FIG.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In FIG. 1, reference numeral 1 denotes a metal shaft of a putter for golf, and 2 denotes a head connected to the lower end of the shaft 1. The head 2 is composed of a bamboo aggregate 3, and a core 4 is loaded inside the aggregate 3. The assembly 3 is produced by bonding a plurality of plate-shaped bamboo pieces to each other in a superficial taraco-shaped block. A recess 5 is formed in the center of the back surface of the head 2, and the thickness of the face portion 6 on the front surface of the head 2 is formed as thin as about 8 mm.

As shown in FIG. 2, the aggregate 3 is a plate-like bamboo piece 11-16 having a width of 30 mm and a length of 130 mm.
Are vertically stacked one on top of another, and they are mutually bonded by an adhesive to be integrally connected. The front side of the assembly 3 (FIG. 2)
(Upper part) is composed of bamboo pieces 11, 12 and 13 with fine fiber densities, and is composed of bamboo pieces 14, 15 and 16 with coarser fiber density toward the inner side of the assembly 3 (lower side in FIG. 2). ing. Bamboo pieces 11, 12, 13, 14, 15, and 16
Are 3 mm, 3 mm, 3 mm, 5 mm,
They are 4 mm and 5 mm. Bamboo pieces 14, 1 on the inner surface
By making the densities of the bamboo pieces 5 and 16 lower than those of the bamboo pieces 11, 12 and 13 on the outer surface side, the resilience to the ball at the time of hitting is increased and the hit feeling is devised to be soft.

Next, a procedure for manufacturing the head 2 will be described. First, as shown in FIGS. 3 and 4, a natural bamboo cylinder 7 having a height H of 10 cm and a diameter D of 15 to 20 cm is prepared. Then, in the cross-sectional shape of the bamboo cylinder 7, the bamboo cylinder 7 is cut and divided radially about its axis O (in FIG. 3, divided into eight equal parts), and six to eight planar arc-shaped divided block bodies 8 are produced. I do. Then, as shown in FIG. 5, each of the arc-shaped divided block bodies 8 is cut in the height direction H so that the thickness t is 3 to
5 mm cut pieces 10 are divided into 3 pieces per one divided block body 8.
Cut out about 4 sheets. The cut pieces 10 are used as plate-like bamboo pieces 11 to 16, which are superposed in a predetermined order, and are bonded together with an adhesive to be integrated.

As described above, the width W is 30 mm and the length L
Is formed and an assembly 3 having a thickness T of 23 mm is formed (see FIG. 2). In this case, bamboo pieces 11, 13 and 15 are used to prevent the aggregate 3 from warping due to aging.
For the bamboo tube 7, a plate cut from the outer surface side is used, and for the bamboo pieces 12, 14 and 16, a plate cut from the inner surface side of the bamboo tube 7 is used. That is, when the assembly 3 is manufactured, the bamboo material on the inner surface side portion of the bamboo tube 7 and the bamboo material on the outer surface side portion of the bamboo tube 7 are alternately stacked and adhered.

As the adhesive, an adhesive obtained by mixing a filler and a curing agent in an appropriate amount with a woodworking adhesive (for example, manufactured by Oshika Shinko Co., Ltd., trade name: Shika-Pi Bond 127, curing material H-3M, etc.) Shall be used. For example, a vinyl acetate-based, styrene-butadiene copolymer-based, polyvinyl alcohol-based adhesive or the like can be used as the adhesive, and calcium carbonate, barium sulfate, ammonium chloride, or the like can be used as the filler and curing agent.

Next, the assembly 3 is processed to produce a head 2 having a predetermined structure. First, as shown in FIGS. 6 and 7, on the surface of the assembly 3 in the laminating direction side, molding is performed according to the shape and size of the head 2, and unnecessary peripheral portions of the assembly 3 (dotting points in FIG. By removing part) 18,
It is formed into a three-dimensional block that matches the desired head shape. Next, the inside of this block body is hollowed out using a thread saw to form a concave hole 17 having a predetermined shape. afterwards,
The lead in a molten state is poured into the concave hole 17, and the core 4 is filled in the inside of the assembly 3.

Next, as shown in FIGS. 8 to 10, the lower end of the shaft 1 is integrally fixedly connected to the shaft fixing hole on the upper surface of the core material 4. Next, as shown in FIG. 11, a bamboo piece having a maximum thickness of 5 mm using the outer curved surface of the bamboo as the face face of the head as it is is attached to the front side and the back side of the assembly 3 and the front face is attached. Function as a back face. These two face plates 19, 20
The bamboo material has a diameter of 180 to 200 m as shown in FIG.
m is made by radially dividing the cylindrical bamboo 21 radially.

Both faces 19 and 20 are polished with sandpaper to remove stains on the surface so that the adhesion of the applied paint is improved. The saw surface of the assembly 3 is also polished with sandpaper to finish the surface smoothly. In the paint finishing step, a special paint for bamboo material is used as an undercoating step of the bamboo product in order to prevent peeling of the coating film due to oil contained in the bamboo. Thereafter, intermediate coating is performed with a sizing paint, air-dried for about 4 hours, and then a urethane clear paint is applied.

According to the present invention, the use of natural bamboo for the head 2 and the face plates 19 and 20 produces an operation and effect not found in metal materials or other materials. The bamboo surface member is
While the fiber density is dense and has sufficient hardness to prevent dents even when hitting a ball, the inside has a coarse and dense fiber density, is soft and has moderate elasticity. That is, as shown in FIG. 13, as the fiber density of the bamboo 22 goes from the outer surface to the inner surface,
The fiber density in the outer part P, the middle part Q, and the inner part R gradually becomes coarse, and the elasticity increases. Focusing on the difference in hardness due to the difference in fiber density between the inside and outside of bamboo, in the present invention,
As shown in FIG. 14 and FIG. 15, the outer curved surface of bamboo is used as it is for the face plate 19, and the fiber density on the inner side of the head is lower than the fiber density on the front side. Thus, when the ball is hit with the face plate 19, the impact force received from the ball can be primarily absorbed by the inner portion of the face plate 19 and secondarily absorbed by the core (lead) 4 portion and removed. As a result, the hit feeling becomes soft, and the ball bounces and rolling becomes good. That is, by making the fiber density of the head 2 rougher toward the inside, the repulsive force against the ball is increased.

[0019]

As described above, according to the present invention, a head is formed from a laminated material obtained by laminating plate-like bamboo pieces, the outer curved surface of bamboo is used as it is on the face plate, As the fiber density increases and decreases toward the inner side, the impact force at the time of hitting the ball can be absorbed well, the feeling of hitting becomes soft, and the repulsion force can be increased to improve the rolling of the ball. . In addition, there is an excellent effect that a good hit feeling can be obtained without lowering the head strength and the head swing speed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a head portion of a golf putter according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a laminated wood which is a material of a head portion.

FIG. 3 is a cross-sectional view illustrating a bamboo tube used for the laminated wood of FIG. 2;

FIG. 4 is a perspective view of FIG. 3;

FIG. 5 is a plan view illustrating a state in which the bamboo tube of FIG. 3 is divided and formed into a plate material.

FIG. 6 is a front view showing a state in which a head is molded from the laminated wood of FIG. 2;

FIG. 7 is a perspective view of FIG. 6;

FIG. 8 is a partially broken front view showing a state where a shaft is attached to a head.

FIG. 9 is a partial cross-sectional rear view of FIG. 8;

FIG. 10 is a partial sectional plan view of FIG. 8;

FIG. 11 is a plan view showing a state where a face plate is attached to the head.

FIG. 12 is a plan view of an essential part for explaining a face plate cut-out portion of a bamboo tube.

FIG. 13 is a main part plan view for explaining fiber density of bamboo.

FIG. 14 is a front view of the head.

15A is a sectional view taken along line AA of FIG. 14, FIG. 15B is a sectional view taken along line BB of FIG. 14, and FIG. 15C is a sectional view taken along line CC of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Shaft 2 Head 3 Bamboo aggregate 4 Core material (lead) 5 Depression 6 Face part 7 Bamboo cylinder 8 Arc-shaped divided block body 10 Cut piece 11 Plate bamboo piece 12 Plate bamboo piece 13 Plate bamboo piece 14 Plate bamboo Piece 15 plate-shaped bamboo piece 16 plate-shaped bamboo piece 17 recessed hole 18 unnecessary part of assembly 19 front face plate 20 back face plate 21 bamboo tube 22 bamboo material

Claims (2)

[Claims] 1. A head is formed of a bamboo laminated material, and a core material is buried inside the laminated material, and the laminated material has a fiber density on an inner surface side which is coarser than that on an outer surface side. Characterized in that a plurality of plate-shaped bamboo pieces are laminated and adhered to each other. 2. A golf putter according to claim 1, wherein the outer surface of the bamboo is used as it is on the face of the head.