JP4502403B2 - Golf club - Google Patents

Description

  The present invention relates to a golf club, and more particularly to a golf club in which the hosel, shaft and socket of a head are devised.

  In many conventional golf clubs, the head is provided with a hosel for mounting a shaft, and a socket is attached to the upper end of the hosel. This socket is made of plastic (celluloid, etc.), mainly to prevent the adhesive from protruding from the upper end of the hosel or the shaft and hosel from being seen from the outside, that is, for the purpose of aesthetic treatment. And attached to the upper end of the hosel.

As a socket invention, there is known a golf club socket in which a swing balance suitable for a golfer to be used can be obtained even when the shaft is exchanged and the characteristic value of the head is not changed (patent) Reference 1). This is because the inner peripheral surface that contacts the shaft is formed of a plastic inner cylinder, and several types of metal outer cylinders with different weights are integrally provided on the outer side of the inner cylinder to match the desired swing balance of the golf club. It allows you to select a heavy socket.
JP-A-9-75484

  Each of the hosel, shaft, and socket described in Patent Document 1 can be attached by forming a male screw on the tip end side of the hosel and forming a female screw on the fitting portion of the socket, or simply male and female. It is also possible to be fitted. The shaft and the plastic inner cylinder may be bonded with an adhesive or may be in a state where no adhesive is used. Adhesion between the hosel and the shaft is performed using an adhesive.

  When the ball is repeatedly hit by a golf club, the shaft repeatedly vibrates, and the socket may be lifted from the hosel or the socket may be damaged. In addition, when the hosel and the socket are attached with screws, it is costly to form the screws, and recently, most of them are designed to reduce the cost by injection molding a socket without the screws. Also in the case of screwing, there is a possibility that the socket rotates due to vibration, moves in the direction in which the socket comes off and rises, and the thickness of the socket is so thin that it may be damaged.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a golf club in which a socket can be formed at a low cost, and the socket is prevented from being lifted and broken after the hosel is attached.

In order to achieve the above-mentioned object, the present invention is located at the outer periphery of the socket at the lower end of the socket that is provided in the head and is attached in contact with the upper end of the hosel in which the shaft insertion hole is formed. Forming a concave portion, forming an undercut portion in the concave portion of the socket, forming a cap-shaped concave portion having a diameter larger than the concave portion below the concave portion of the socket, and an inner peripheral surface of the concave portion of the hosel The adhesive that contacts the outer periphery of the upper end portion and adheres the shaft to the hosel protrudes from the hosel and flows into the concave portion , undercut portion, and concave portion of the socket so that the socket is adhered to the shaft and the hosel .

According to the present invention, a recess located largely its outer periphery than the insertion hole of the shaft to the lower end of the socket mounted in contact with the upper end of the hosel insertion hole provided shaft is formed in the head, the An undercut portion is formed in the concave portion of the socket, and a cap-shaped concave portion having a diameter larger than that of the concave portion is formed below the concave portion of the socket, and an inner peripheral surface of the concave portion contacts an outer periphery of the upper end portion of the hosel. Since the adhesive that bonds the shaft to the hosel protrudes from the hosel and flows into the recess , undercut, and recess of the socket, the socket is bonded to the shaft and the hosel, so the socket and hosel need not be screwed together The socket can be prevented from lifting from the hosel, and the socket can be formed at a low cost. Also, a recess is formed hosel, the one obtained by interposing an elastic body in a space recessed portion of the hosel is formed, or the vibration of the shaft causes ascended float adverse effect on the socket, for example a socket, or to damage risk Can be prevented. Recent carbon shafts have been made thinner and lighter thanks to the development of highly elastic carbon fibers, and while maintaining sufficient deflection, there is also an increased risk of breakage at the tip part. It is effective to prevent breakage by interposing.

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a cross-sectional view of the hosel 1, shaft 2, and socket 3 assembled together. The hosel 1 is integrally formed with a head (not shown). The hosel 1 is formed with an insertion hole 4 for the shaft 2, and a dish-like recess 5 is formed at the upper end of the hosel 1 which is larger than the insertion hole 4 and located on the outer periphery thereof. An insertion hole 6 of the shaft 2 is formed in the socket 3, a recess 7 that is larger than the insertion hole 6 and located on the outer periphery is formed at the lower end thereof, and a shade-like recess 7 </ b> A is further formed below the recess 3. The inner peripheral surface of 7A is formed as a tapered surface 7B. The recess 7A has a diameter larger than that of the recess 7, and the adhesive flows into a space including the taper surface 7B having the diameter increased as described later. The recess 7 of the socket 3 has a radius larger than the insertion hole 6 by 0.5 to 1.5 mm (symbol t in the figure), the depth 7 of the recess 7 is 2 to 3 mm, and the total length of the socket 3 is 10 mm or more. Particularly, the socket 3 having a short length of 10 to 16 mm is effective because the contact between the shaft 2 and the inner surface of the socket 3 is small.

  2 and 3 are a half sectional view and a plan view showing details of the hosel 1, and in this embodiment, the outer peripheral end of the recess 5 is formed in the flat portion 5A, and the hosel is inward from the flat portion 5A. A tapered surface 5B having an inclination angle of 30 ° with the central axis is formed. The inner end of the tapered surface 5B is formed into a curved surface with a corner.

  FIG. 4 is a half sectional view showing the details of the socket 3. In this embodiment, a recess 7A having a larger diameter is formed under the recess 7, and the inner peripheral surface of the recess 7A is a tapered surface 7B. Is formed. Since such a socket 3 does not need to form a screw, it can be easily and inexpensively molded by a plastic injection molding method. In particular, the diameter of each of the insertion hole 6, the recess 7 and the recess 7A is the smallest in the insertion hole 6, and then the recess 7 and the largest diameter in the order of the recess 7A. A conical shaped product can be smoothly extracted from its head.

  FIG. 5 shows the socket 3 with an undercut portion formed in the recess 7. Even if such an undercut portion 70 is molded, the molded product itself is made of plastic and has flexibility, so that it can be released.

  FIG. 6 shows another embodiment, in which a recess 50 similar to the recess 7 of the socket 3 is formed below the dish-like recess 5 formed at the upper end of the hosel 1. An elastic body 8 such as rubber or foam is interposed in a space formed by 50, and the elastic body 8 is in contact with the shaft 2. Also in this embodiment, the adhesive for fixing the shaft 2 to the hosel 1 protrudes from the hosel 1 and flows into the elastic body 8 to bond the elastic body 8 and the shaft 2, but at least the recess 7 of the socket 3. Is provided with an adhesive 9. The adhesive 9 may be provided in the recess 7 </ b> A in addition to the recess 7. In the hosel 1, the dish-shaped recess 5 is not formed.

  In the embodiment of FIG. 1, the hosel 1 is not formed with the concave portion 7 as formed in the socket 3, but the concave portion 50 similar to that of FIG. 6 is formed, and the concave portions 7, 50 and the concave portion 7 </ b> A are formed. It is also possible to fill the space to be filled with an adhesive instead of the elastic body 8.

  Although the recess 7A and the tapered surface 7B are formed in the socket 3, these may not be formed, and only the recess 7 may be formed in the lower end portion of the socket 3. In the case where the recess 7A and the tapered surface 7B are provided, the adhesive surface between the socket 3 and the hosel 1 is increased at this portion, and the socket 3 is effectively prevented from being lifted. The recess 5 having a tapered shape in which the inner peripheral surface of the hosel 1 is expanded toward the outside is for smoothly inserting the shaft 2.

  The hosel 1 is integrally formed with a head by a head forming material, for example, a titanium alloy, and the socket 2 is injection-molded by a thermoplastic resin such as celluloid. The shaft 2 may be made of steel as well as fiber reinforced plastic (carbon shaft).

Sectional drawing which shows suitable embodiment of this invention. Half sectional view of the hosel. Top view of the hosel. The half sectional view of a socket. The half sectional view showing the modification of a socket. The half sectional view showing other embodiments.

Explanation of symbols

1 Hosel 2 Shaft 3 Socket 4, 6 Insertion hole 7 Recess

Claims (3)

Forming a recess located on the outer periphery of the socket which is provided in the head and is attached in contact with the upper end of the hosel in which the insertion hole of the shaft is formed, which is larger than the insertion hole of the shaft;
Forming an undercut portion in the recess of the socket;
Forming a shade-like recess having a diameter larger than that of the concave portion below the concave portion of the socket;
The inner peripheral surface of this recess contacts the outer periphery of the upper end of the hosel,
A golf club characterized in that an adhesive for adhering a shaft to a hosel protrudes from the hosel and flows into a concave portion , an undercut portion, or a concave portion of the socket to bond the socket to the shaft and the hosel. 2. The upper end of a hosel provided with a head and having a shaft insertion hole formed therein is formed with a recess that is larger than the insertion hole and positioned on the outer periphery thereof, and an adhesive is provided in the recess. Golf club. 3. The golf club according to claim 2, wherein an elastic body is interposed in a space formed by the concave portion of the hosel, and an adhesive is provided in the concave portion of the elastic body interposed portion.

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