JP2001062000A - Head of golf club - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a head of golf club of stabilizing the support of pipe for shaft fixing, which fixes the shaft, lighten the periphery of shaft fixing part and offering a good weight balance. SOLUTION: For a metallic hollow head of golf club 1, which fixes a pipe for shaft fixing 3 that has a shaft fixing hole 3a, the bottom end part side of pipe for shaft fixing 3 is expanded into the hollow part of head of golf club 1, an expanding piece 3h is set on the bottom end side of pipe for shaft fixing 3, and the expanding piece 3h fixes the sole part of head of golf club.

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.

[0002]

2. Description of the Related Art Conventionally, most hollow heads made of metal have been manufactured by precision casting. In many cases, such a cast head has an outer shell body and a portion around the shaft fixing hole integrally formed, and the periphery of the shaft fixing hole, that is, the heel region becomes heavy, so that a head with good weight balance is obtained. Difficult to do.

On the other hand, Japanese Utility Model Publication No. 63-17492 discloses a hollow head in which a shaft fixing pipe is fixed to a plurality of outer shells formed by pressing or forging. The shaft fixing pipe has an upper end fixed to an inner peripheral surface of a neck portion integrally formed with the outer shell, and a lower end protruding into the hollow portion of the head. According to such a head, the periphery of the shaft fixing portion can be lightened, so that the weight balance of the head is good. However, since the shaft fixing pipe is not supported at its lower end side, it is unstable. Becomes

[0004] Japanese Patent Laid-Open No. 6-142236 discloses a head provided with a shaft fixing pipe extending from the top side to the sole side of the head. According to such a head, the support of the pipe for fastening the shaft is sufficient, but the pipe shape is maintained even in the portion where the shaft is not actually inserted, and accordingly, the additional weight is added, and the head becomes Weight balance is bad.

The present invention has been made in view of the above-mentioned problems, and stabilizes the support of a shaft fastening pipe for fastening a shaft, and reduces the weight around the shaft fastening portion to achieve a good weight balance. It is an object to provide a golf club head.

[0006]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention relates to a metal hollow golf club head in which a shaft fixing pipe having a shaft fixing hole is fixed. A lower end portion is projected into a hollow portion of the golf club head, and a projection is provided at a lower end side of the shaft fastening pipe, and the projection is fastened to a sole portion of the golf club head.

The lower end side of the shaft fixing pipe is provided with a projecting piece and is not formed in a cylindrical shape, so that the weight can be reduced and the tip side of the projecting piece is fixed to the sole portion. Therefore, the support of the shaft fixing pipe is stabilized.

[0008]

1 and 2 are views showing an embodiment of the present invention. FIG. 1 (a) is a perspective view of a head, FIG. 1 (b) is an exploded perspective view of the head, and FIG. 2 (a) is a partial cross-sectional view of the head in the toe-heel direction, and FIG. 2 (b) is a partial cross-sectional view of the head with the shaft inserted therein in the toe-heel direction.

The head 1 has a top 1a, a sole 1
b, a toe 1c, a back 1d, a heel 1e, and a face 1f, and are formed by welding a plurality of outer shell members. In this case, each of the outer shell members is formed independently or by integrating arbitrary members by casting, pressing, forging, or the like, and these are welded to each other to form a head. In the present embodiment, the top 1
a and the face portion 1f are independently formed, and the sole portion of the sole portion 1b, the toe portion 1c, the back portion 1d, and the heel portion 1e are integrally formed.

The head 1 has a face portion 1f welded to a front peripheral edge of an outer shell body on a sole side portion, and further, a projection 3h and an upper portion 3b of a shaft fixing pipe 3 are welded to a sole portion 1b and a heel portion 1e, respectively. Finally, the top portion 1a is formed in a hollow shape by welding to the upper opening of the outer shell of the sole side portion and the upper portion 3b of the shaft fixing pipe. The shaft fixing pipe 3 is formed separately from the outer shell of the head, and has a shaft fixing hole 3a vertically penetrated so as to insert the distal end side of the shaft 30.
The head has an upper portion 3b protruding outside from the surface of the head a and a cylindrical lower portion 3c protruding into the hollow portion S of the head.

The upper portion 3b is formed in a skirt shape (thickness gradually increasing in diameter) so that the outer peripheral surface gradually increases in diameter as it goes downward, and the outer peripheral surface is as shown in FIG. 2 (a). Then, it is welded and fixed to the edges of the top portion 1a and the heel portion 1e (the welded portion is indicated by reference numeral 5).

The lower portion 3c protrudes to approximately half of the hollow portion S of the head, and has a sole portion 1
A columnar protruding piece 3h extending to b is provided. The protruding piece 3h is formed integrally with the lower part 3c, and its tip is welded and fixed to the inner surface of the sole 1b (a welded portion is indicated by reference numeral 5a). Further, a step portion 3g for reducing the diameter of the shaft fixing hole 3a is formed in the shaft fixing hole 3a of the lower portion 3c so as to prevent the lid 7 from falling downward. Therefore, the shaft 30 is inserted into the hollow portion S but does not protrude below the shaft fixing hole 3a.

When the cover 7 is bonded and fixed to the inner peripheral surface of the fixing hole 3a of the shaft fixing pipe 3, the cover 7 is first inserted from above and abuts on the step 3g to form a bottom. In order to prevent the adhesive from flowing into the hollow portion S, a shaft fixing adhesive pool 9 is formed between the shaft 30 and the lower end edge. The shaft 30 may be inserted into the fixing hole 3a without directly inserting the lid 7, and the lower edge may be directly applied to the step 3g to be fixed.
A weight may be inserted between the lid 7 and the lower edge of the shaft 30.

According to the configuration of the head as described above, the lower side of the shaft fixing pipe 3 is not formed in a cylindrical shape, so that the weight can be reduced accordingly, and the heel side of the head is also reduced in weight, so that the entire head is reduced. Weight balance can be improved. The shaft fixing pipe 3 has an upper side welded to the top part 1a and the heel part 1e, and a protruding piece 3h provided on the lower end side thereof is welded to the sole part 1b. The wearing condition is stabilized.

Next, another embodiment of the present invention will be described with reference to FIGS. In the embodiment described below, the same portions as those in the above embodiment are denoted by the same reference numerals, and the description thereof will be omitted.

The projecting piece 3p provided below the shaft fastening pipe 3 of this embodiment is formed by cutting out a part of the outer peripheral surface on the lower end side of the shaft fastening pipe 3 formed in a cylindrical shape. Since the remainder becomes the projecting piece 3p, the side of the projecting piece 3p near the shaft fixing hole 3a is formed in a concave shape. Therefore, the concave surface of the protruding piece 3p is continuously formed on the inner side surface of the shaft fixing hole 3a penetrating up and down of the shaft fixing pipe 3. By forming the protruding piece 3p in a concave shape in this way, chips (cut chips, welding chips, etc.) generated when the outer shell members constituting the head 1 are welded can be easily taken out. That is, as shown in FIG. 4B, when the air blowing nozzle 20 is inserted through the opening of the shaft fixing hole 3a and air is blown into the hollow portion S, the debris existing in the hollow portion is indicated by an arrow. As described above, the protrusion 3p formed in a concave shape is guided by the inner peripheral surface on the shaft fixing hole 3a side and is easily swept out to the outside. In the configuration of such a protruding piece, an inclined portion 3q is formed at the lower end of the protruding piece 3p, and the front end portion is joined to the sole portion 1b so that there is no step with the sole portion 1b. Is preferred. By forming such an inclined portion, it is possible to more easily sweep out debris accumulated inside. Further, even without blowing air, the head can be turned upside down and swept out from the opening of the shaft fixing hole 3a.

The embodiments of the present invention have been described above, but the present invention is not limited to the above embodiments. For example, the shape of the projecting piece provided at the lower end of the shaft fixing pipe can be variously modified. Further, the shaft fastening pipe may have a configuration in which a neck is formed in a top portion and the interior is fastened inside, as in the conventional configuration.

[0018]

According to the present invention, a golf club head having a good weight balance can stably support a shaft fixing pipe for fixing a shaft provided inside the head, and reduce the weight around the shaft fixing portion. Is obtained.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, wherein (a) is a perspective view of a head, and (b) is an exploded perspective view of the head.

FIG. 2 is a diagram showing a head structure shown in FIG. 1;
(A) is a partial sectional view of the head in the toe-heel direction,
(B) is a partial sectional view of the head with the shaft inserted in the toe-heel direction.

FIG. 3 is a view showing another embodiment of the present invention, wherein (a)
2 is a perspective view of the head, and FIG. 2B is an exploded perspective view of the head.

FIG. 4 is a view showing a head structure shown in FIG. 3;
(A) is a partial sectional view of the head in the toe-heel direction,
(B) is a partial sectional view in the toe-heel direction of the head showing a state in which air is blown into the hollow portion before the shaft is fixed.

FIG. 5 is a partial cross-sectional view in the toe-heel direction of the head with a shaft inserted in the head structure shown in FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Head 1a Top part 1b Sole part 3 Shaft fixing pipe 3a Shaft fixing hole 3h, 3p Projection piece 30 Shaft

Claims (3)

[Claims] 1. A metal hollow golf club head having a shaft fastening pipe having a shaft fastening hole fastened thereto, wherein a lower end side of the shaft fastening pipe projects into the hollow portion of the golf club head, A golf club head, wherein a protrusion is provided on a lower end side of the shaft fixing pipe, and the protrusion is fixed to a sole portion of the golf club head. 2. The golf club according to claim 1, wherein the protruding piece has one side formed in a concave shape by notching a part of an outer peripheral surface on a lower end side of the shaft fastening pipe. head. 3. The golf club head according to claim 2, wherein the lower end of the projecting piece on the concave side is joined to the sole portion so that there is no step with the sole portion. .