JP2001000607A - Golf club shaft and mandrel for manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mandrel for manufacturing a golf club shaft meeting changes in the hardness, the torsion, the kick point and the like quickly and properly, and a golf shaft. SOLUTION: A mandrel for manufacturing a golf shaft is formed such that the tip diameter is 2.5 mm to 5 mm, the rear end diameter is 13 mm to 20 mm, the length is 80 cm to 180 cm, and a round body part (m) with a round section and an angular body part (n) with a five- to twelve-side polygon section are appropriately combined in the longitudinal direction. The length of the round body part (m) is 20 cm to 65 cm, and the length the angular body part (n) is 25 cm to 65 cm. The mandrel can be manufactured by constituting of one of the round body part (m) and one of the angular body part (n), one of the round body part (m) and two of the angular body parts (n), or two of the round body parts (m) and one of the angular body part (n). The golf club shaft is manufactured by winding several layers of carbon fiber nonwoven cloths on the mandrel.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a carbon golf club shaft and a mandrel for manufacturing the same.

[0002]

2. Description of the Related Art A golf club shaft made of carbon is produced by grinding a hard steel material into a tapered cylindrical body, forming a mandrill, and winding a carbon fiber nonwoven fabric in a multi-layered form around its outer peripheral surface.

[0003]

The conventional mandrill has a uniform circular cross section in the tapered length direction. Therefore, the golf ball is formed by winding a carbon fiber nonwoven fabric around the outer peripheral surface using the mandrel as a core metal. The shaft is formed into a uniform hollow cylinder inside. Thus, the golf shaft has a minimum diameter at the tip to which the head is attached,
When the golf club is swung up on the shoulders for hitting the ball and is swung down in an arc, a torsional force acts on the shaft due to the action of the centrifugal force due to the weight of the head. It concentrates mainly from near the tip to near the center.

By the way, the above-mentioned twisting force is not constant due to the height and strength of the user or the peculiar habit of each user, and the kicking direction from the wood to the iron changes the flying direction of the hit ball. Various problems occur such as the distance is not constant. In order to solve this complicated problem, proposals have been made to make the mounting portion of the head bulge, or to change the diameter from the middle of the shaft to form a stepped, shaped shape, There is a sense of incongruity, and there is a limit to the proper handling of such subtle swings depending on individual differences. The present invention seeks to solve the above problems.

[0005]

According to the present invention, a hard steel material is ground and has a tip diameter of 2.5 mm to 5 mm and a rear end diameter of 13 mm to 13 mm.
20mm size and length size 80cm-180cm
The golf club manufacturing mandrill has a configuration in which a circular body having a circular cross section in the length direction and a rectangular body having a cross section of 5 to 12 squares are appropriately combined. , The length of this circular body is 20cm ~ 65c
m, the length of the rectangular body is 25 cm to 65 cm, and the circular body and the rectangular body each have a single configuration,
Alternatively, the golf club shaft is made of one circular body part and two square body parts or one square body part and two circular body parts. Is wound around several layers.

[0006]

1A, 1B, 1C, and 1D are perspective views of a mandrill 1 according to the present invention, in which a hard steel material having a length of 80 cm to 180 cm is ground and the tip diameter is approximately 2. 5mm ~ 5mm, rear end diameter is about 13mm ~ 20mm
And a circular body part having a circular cross-sectional shape in the entire length range thereof, and a square body part having a hexagonal shape having a hexagonal shape of 12 to 12 are appropriately combined and arranged. In the example shown in the figure, A is a circular part m with a certain range on the tip side, and the rest is a square body part n. B is the reverse of the above, that is, a square body part n on the tip side and the rest is a circular body part m. What was done, C is the one where the front end side and the rear end side are the circular body part m, and the middle part is the square body part n, D
Indicates that the front and rear ends are square bodies n, and the middle part is a circular body m.

The lengths L ₁ and L ₂ defined by the circular body portion m and the square body portion n correspond to the overall length L of the club shaft, that is, various lengths depending on the length of a driver or iron. and occupy the length dimension _{L 1} of specifically Entai portion m is 20Cm～65cm length dimension _{L 2} of Kakutai unit n is made as 25Cm～65cm.

[0008] The mandrill according to the present invention is configured as described above. To manufacture a golf shaft using the mandrill, a carbon fiber non-woven fabric impregnated with a resin liquid is wound around the mandrel in a conventional manner in multiple layers. In addition, after the surface is hardened and tightened while winding the heat-resistant film, the surface is hardened by high heat treatment in an electric furnace.

[0009] Figure 2A performs polishing process after curing the above, a partially broken perspective view of a golf shaft 2 extracted from the mandrel 1, Figure 2B is a cross-sectional side view of the X ₁ and X ₂ places Figure 2A . As can be seen in the figure, a golf shaft 2 manufactured using the mandrill 1 having the above configuration.
In the case of, a hollow square body part m ′ is formed at the inner surface part of the shaft at a circular body part m of a mandrill, and a hollow square body part n ′ is formed at a square body part n.

FIGS. 3, 4 and 5 show golf club shafts 2 ', 2 "and 2'" manufactured from mandrills 1 ', 1 "and 1'", respectively. , A
Some broken perspective view, B is a cross-sectional side view of the X _1, X ₂ and X ₃ positions each Les. As can be seen in this drawing, each golf shaft has an inner surface portion having a hollow circular cross-section m 'and a hollow hollow cross-section n' each having a fixed length within one range, or the former two. One of the latter or a combination of one of the former and two of the latter will be formed.

The combination arrangement of the hollow circular cross-section m 'and the hollow hollow cross-section n' and the length of each of them are different depending on the club shaft of a driver or iron.
In addition, the hardness and kick point are designed to be variously varied according to the age, skilled person, strength, etc., and the hardness is L, R, SR, S in general golf specifications. , SX, X, etc., and the kick point is a hand tone, a medium tone, a first tone, and the like.

The above adjustment and design are based on the hollow section n '
The ribs p formed at the other portions exert a rib effect to increase the bending and torsional resistance with other portions. Therefore,
For example, if the tip side is a hollow square cross section, the kick point can be moved accurately from the tip side to the rear by the length of the kick point, and together with the appropriate setting of the kick point, In this case, it is possible to prevent the occurrence of inconsistency or the like due to the frequency of use found in conventional products.

In general, in order to extend the flight distance of a hit ball with a driver shot, the bending of the driver shaft swung up over the shoulder from the shoulder is increased. In this case, the shaft portion on the grip side is used. Is formed as a hollow circular cross-section m ′, and a hollow hollow cross-section n ′ that is unlikely to be twisted is disposed on a shaft portion on the head side so that the head can be accurately shot toward the hitting line. It is. As described above, in the present invention, the length of the mandrel and the length of the square body n and the square shape and the like of the mandrel are appropriately selected and designed so that the manufacturing design of the shaft adapted to the height, the age, the arm strength, the habit of each person, and the like is performed. It can be easily obtained.

In the illustrated example, all mandrel portions of the mandrel are hexagonal, but are set in the range of pentagon to dodecagon based on a number of experimental results of the present inventor. Therefore, this range does not have a sense of incongruity in the appearance of the product shaft,
In addition, it is easy to obtain appropriate strength against twisting and bending. When a plurality of squares are provided, the same square may be used when a plurality of squares are provided. However, the combinations may be appropriately changed.

[0015]

According to the present invention, as described above, the mandrel has a special structure, so that it is possible to quickly and accurately change or adjust the hardness, torsion, kick point, etc. of the golf club shaft when manufacturing a carbon golf club shaft. The technical configuration described above is applied to the inside of the hollow of the golf club shaft and the appearance of the product is not different from the conventional product, so that there is no sense of incompatibility.

[Brief description of the drawings]

FIG. 1 is a perspective view of a mandrel according to the present invention.

FIG. 2 is a partially cutaway perspective view of a carbon golf club shaft manufactured by the mandrel A, and FIG.

FIG. 3 is a partially cutaway perspective view of a carbon golf club shaft manufactured by the mandrel B, and FIG.

FIG. 4 is a partially cutaway perspective view of a carbon golf club shaft manufactured by the mandrill C, and FIG.

FIG. 5 is a partially cutaway perspective view of a carbon golf club shaft manufactured by the mandrill D, and FIG.

[Explanation of symbols]

1, 1 ', 1 ", 1"' Mandrill 2, 2 ', 2 ", 2'" Golf club shaft m Circular body n Square body m 'Hollow section hollow section n' Hollow section hollow angle Body

Claims (5)

[Claims] 1. A hard steel material is ground and has a tip diameter of 2.5 mm.
Within a range of ５5 mm, a rear end diameter of 13 mm-20 mm and a length dimension of 80 cm-180 cm, a circular section having a circular cross section and a pentagonal to pentagonal cross section were formed. A mandrel for manufacturing a golf club, characterized in that the mandrel has a configuration in which a rectangular body portion is appropriately combined and arranged. 2. The length of the circular portion is 20 cm to 65 c.
The mandrill for manufacturing a golf club according to claim 1, wherein the length of the square body portion is 25 cm to 65 cm. 3. The mandrel for manufacturing a golf club according to claim 1, wherein the mandrel is constituted by one circular body and one square body. 4. The mandrel for manufacturing a golf club according to claim 1, wherein the mandrel is formed of one circular body and two rectangular bodies or one rectangular body and two circular bodies. . 5. A golf club shaft manufactured by winding the carbon fiber nonwoven fabric in a multilayer shape using the mandrill for manufacturing a golf club according to claim 3 or 4.