JP3066297B2 - Golf club shaft mounting structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a golf club shaft mounting structure.

[0002]

2. Description of the Related Art In general, a golf club shaft is inserted into a hosel integrally formed with a head and fixed to the hosel with an adhesive. When the ball is hit with the head, a very large impact force is applied to the tip of the shaft.
In addition, a large rotational force is applied to the head by the collision with the ball, particularly at the time of off-center hit, and the rotational force of the head is transmitted to the shaft. When the head tries to rotate, the shaft gripped by the golfer resists the rotation of the head due to the grip force, so that the hosel and the shaft relatively rotate. Also, in iron clubs and metal wood, the head and hosel are integrally formed of metal material, so if you increase the proportion of the weight of the hosel part to the whole, the center of gravity of the whole head will be higher and closer to the heel As a result, hosels have attempted to be as short as possible.

[0003]

As described above, when the ball is hit with the head, the hosel also rotates with the rotation of the head with respect to the shaft. As a result, the hosel and the shaft rotate relative to each other, and the shaft is turned into the hosel. The adhered adhesive may be peeled off. In particular, when the hosel is shortened, the adhesive is easily peeled off. When the adhesive is peeled off, the shaft comes off.

Therefore, the present invention can prevent the shaft from being separated from the hosel even if the hosel is shortened to lower the position of the center of gravity and the center of gravity is positioned at the center of the face. It is an object of the present invention to provide a golf club shaft mounting structure in which the shaft mounting is prevented.

[0005]

[SUMMARY OF] To achieve the above object, the present invention, together with a hosel for shaft attachment provided in the head by mounting the shaft and fixed with an adhesive,
A part of the shaft that is inserted into the socket
A notch for preventing relative rotation with the bracket is provided,
The shaft is inserted into the hosel insertion part of the socket where the shaft is press-fitted.
Projections or to form a flat portion along a line direction, in which recess or flat portion fitted is formed on or flat portion to the projecting portion of the socket hosel inner surface.

[0006]

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows a cross section of the hosel 2, the socket 3 and the shaft 4. A flat portion 31 along the axial direction is formed on the outer periphery of the hosel insertion portion 3A of the socket 3 into which the shaft 4 is press-fitted and whose relative rotation is prevented. The flat part 21 which fits with the flat part 31 of the socket 3 is formed on the inner surface of the hosel 2. FIG. 2 shows a longitudinal section when the shaft 4 is mounted. A hosel 2 is provided on the head 1, and the hosel 2 and the shaft 4 are bonded with an adhesive 5. The hosel insertion portion 3A is also adhered to the inner surface of the hosel 2. In this embodiment, the head 1 and the hosel 2 are integrally formed of a metal material so that the portion protruding outside the hosel 2 is reduced, and the tip side of the hosel 2 extends into the head 1 so as to lower the position of the center of gravity. ing.

FIG. 3 shows that a recess 22 is formed on the inner surface of the hosel 2, and a convex portion 32 fitted into the recess 22 is formed on the outer peripheral surface of the hosel insertion portion 3 A of the socket 3 along the axial direction. It is. Also in this embodiment, the relative rotation between the hosel 2 and the socket 3 is prevented by the fitting of the recess 22 and the projection 32.

FIG. 4 shows a cross section of a portion of the shaft 4 to be inserted into the socket 3, and shows an example in which a cutout 41 is formed in a part of the outer peripheral surface of the shaft 4 along the axial direction. Is a plan view of the notch 41 as viewed from above. The shaft 4 having such a notch 41 is connected to the socket 3
, The rotation of the shaft 4 with respect to the socket 3 can be further prevented. Even without such a notch 41, the shaft 4 (even if it is made of metal) is press-fitted into the socket 3 made of synthetic resin,
Although the relative rotation between the socket 3 and the shaft 4 can be sufficiently prevented, it is preferable to apply an adhesive between the shaft 4 and the inner peripheral surface of the socket 3.

FIG. 6 shows a half section of the socket 3, showing a state in which the thickness of the hosel insertion portion 3A where the flat portion 31 is formed is thin.

The socket 3 and the shaft 4 are press-fitted into the socket 3 so that relative rotation is prevented, and the socket 3 is attached to the hosel 2 so as not to rotate.
Even if a force (rotational force around the axis of the shaft 4 of the head 1) for separating the adhesive between the shaft 4 and the hosel 2 acts, relative rotation between the socket 3 and the shaft 4 is prevented. Since the diameter of the shaft 4 on the distal end side is usually small, the pressure contact with the shaft 4 at the upper end side of the socket 3 becomes stronger. Are equal. When the socket 3 is formed of a metal material, the inner surface of the socket 3 may be processed in the same manner as the flat portion 21, and the shaft 4 may be processed in the same manner as the flat portion 31.

[0012]

As described in the foregoing, according to the present invention, together with a hosel for shaft attachment provided in the head by mounting the shaft and fixed with an adhesive, inserted into the socket
Phase of the shaft and socket
A notch is provided to prevent counter rotation, and the shaft is
Along the hosel insertion part of the inserted socket along the axial direction
Form a convex or flat part, and insert the socket on the inner surface of the hosel.
Recesses or flat portion formed to fit into or flat portion to the projecting portion
So, even if the head side tries to rotate around the shaft, the socket is attached to the hosel so that it can not rotate, and the socket is attached to the socket so as to prevent relative rotation, so the hosel is attached to the shaft. It is possible to prevent the adhesive from peeling off due to the rotation and the shaft from coming off as a result.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a preferred embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a state in which a shaft is mounted on a hosel.

FIG. 3 is a cross-sectional view showing another embodiment.

FIG. 4 is a sectional view of a socket insertion portion of the shaft.

FIG. 5 is a plan view of the cutout portion of FIG. 4 as viewed from above.

FIG. 6 is a half sectional view of a socket.

[Explanation of symbols]

 Reference Signs List 1 head 2 hosel 3 socket 3A hosel insertion part 4 shaft 5 adhesive 21 flat part 22 concave part 31 flat part 32 convex part

Claims (1)

(57) [Claims] 1. A shaft (4) mounted on a shaft mounting hosel (2) provided on a head (1) , fixed with an adhesive, and inserted into a socket (3).
The part of (4) with the shaft (4) and the socket (3)
A notch (41) for preventing relative rotation is provided.
Hosel insertion of socket (3) into which shaft (4) is press-fitted
The projection (32) or the flat portion along the axial direction
Tan portion to form a (31), a recess to be fitted to the <br/> protrusion of the socket in the hosel inner surface (32) or flat portion (31) (2
2) A shaft mounting structure for a golf club, wherein the flat portion (21) is formed .