JP2005066148A - Golf club head - Google Patents

Abstract

To prevent the occurrence of cracks in a joint portion of a golf club head having a fiber reinforced resin plate part at least in a crown portion.
SOLUTION: A metal head body 10 having an opening 10K provided in a crown portion of a hollow wood head, and the opening is formed by a fiber reinforced resin plate component 12 with an adhesive interposed therebetween. In the golf club head in which the head part is closed, the head body is configured to adhere and join the front surface 10U of the head body and the back surface of the plate part without having a stepped wall surface facing the peripheral end surface of the plate part.
[Selection] Figure 1

Description

  The present invention relates to a golf club head using a fiber reinforced resin plate component for a crown portion of a hollow wood head including a fairway wood and a utility.

  Conventionally, hollow wood heads that replace conventional wood heads have been made of metal mainly composed of stainless steel, titanium alloy, aluminum, or the like. For this reason, the crown part is also made of metal, and it can be said that the center of gravity is high accordingly. When hitting a ball, fiber reinforced resin plate parts were used for the crown to make it easier to deform the crown, increasing the loft angle of the face and extending the flight distance, and lowering the center of gravity of the head. Golf club heads are on sale. Such golf club heads are also disclosed in publications shown in Patent Document 1 and Patent Document 2 below. These plate parts are in a form that does not reach the hosel projection.

However, as a result of performing a hit test of a golf club head having at least a crown part of these fiber-reinforced resin plate parts (the crown part is repeatedly bent upward by hitting the face part), the durability range It was found that a peeling crack occurred at the end surface joint between the component peripheral edge surface and the head body stepped wall surface at the time when it should be within.
JP 2003-111874 A JP 2003-199848 A

  The problem to be solved is to prevent the occurrence of cracks in the joint portion of a golf club head having a fiber reinforced resin plate part at least in the crown portion.

  According to a first aspect of the present invention, there is provided a metal head main body having an opening in a crown portion of a hollow wood head, and the opening is formed by a fiber reinforced resin plate component with an adhesive interposed between the head main body and an adhesive. In the golf club head having a closed portion, the head main body does not have a stepped wall surface facing the peripheral end surface of the plate part, and the surface of the head main body and the back surface of the plate part are bonded and bonded. Provide club head.

  According to a second aspect of the present invention, the head main body has a hosel convex portion that is fixed to the shaft so as to protrude from the surface of the crown portion, and the plate component is integrally extended to the middle position or end position of the hosel convex portion. A golf club head according to claim 1 is provided.

  According to the first aspect of the present invention, since the head main body has a structure in which the front surface and the back surface are bonded together without providing the stepped wall surface facing the peripheral end surface of the plate component, the narrow end surface and the stepped wall surface This prevents the occurrence of peeling cracks due to impact. Therefore, the durability of the joint portion of the golf club head can be improved.

  In claim 2, since the plate part is integrally extended to the midpoint position or the end position of the hosel convex portion, it is a matter of course that the bonding area can be increased and the overall joining force is improved and the rigidity is high. Since it joins with the hosel convex part, the joint strength of the plate component with respect to a head main part improves more. Further, after the plate parts are joined, the periphery of the plate parts is usually polished or ground to finish the head body surface smoothly. At this time, if the peripheral edge of the plate part terminates near the base of the hosel convex part, the base part has a hollow shape, so that it is difficult to grind the peripheral edge. However, if it is integrally extended to the midpoint position or the end position of the hosel convex portion, the operation of grinding the edge portion becomes easy. In particular, polishing can be performed while rotating the head around the hole core of the hosel hole, which facilitates the polishing operation.

Hereinafter, the present invention will be described in detail with reference to the drawings.
1 is an exploded perspective view of a golf club head according to the present invention, FIG. 2 is a plan view of the golf club head after the parts of FIG. 1 are bonded and bonded, and FIG. 3 is a front view of the head. 4 is a rear view of the head, FIG. 5 is a cross-sectional view taken along line EE in FIG. 2, and FIG. 6 is a cross-sectional view taken along line FF in FIG. The metal head main body 10 mainly composed of stainless steel, titanium alloy, aluminum, or the like has a front face portion 10F, a heel portion 10H, a toe portion 10T, a back portion 10B, and a sole portion 10S. Further, a well-known hosel convex portion 10ZT having a hole 10ZTH for inserting and fixing the shaft S is formed on the head main body upper portion (crown portion) so as to protrude. Further, in this example, the hosel part has a hosel convex part projecting to the outside and a hosel cylinder part 10TB extending continuously inside the head, and the vicinity of the hosel part is the other part of the head body. High rigidity compared to the above region.

  Further, the crown portion is provided with an opening 10K leaving a region near the hosel convex portion 10ZT. In addition to the region near the hosel convex portion, a receiving portion 10U for mounting and bonding a plate component 12 described later is formed around the opening along the face portion, the toe portion, and the back portion. The width of the receiving part along the face part, the toe part and the back part is about 10 mm (5 to 15 mm), which is a margin for joining and integrating plate parts.

  As can be seen from FIG. 1 and the cross-sectional views of FIGS. 4 and 5, a stepped portion having a wall surface facing the peripheral end surface of the plate component when placed on the entire upper portion of the head body 10. It is not formed at all, and it simply becomes an adhesive bonding form in which the peripheral back surface of the plate component is placed on the receiving portion 10U of the head body. Since the receiving portion has the above-mentioned width, the bonding area is sufficient in terms of the plate component bonding strength, and cracks are unlikely to enter the bonding boundary. Therefore, the golf club head in which the plate parts are joined is less likely to cause a peeling crack due to impact.

  The receiving portion 10U in the above example has a smooth shape without a step to receive and fix the back surface of the plate component 12, but there is a step on the back surface to correspond to the back surface shape of the plate component. For example, a corresponding step can be provided.

  On the other hand, the plate component 12 is made of a fiber reinforced resin made of synthetic resin such as epoxy resin as a matrix and reinforced with reinforcing fibers such as carbon fibers. This is not only formed in a dimensional shape that can be placed on the receiving portion 10U to close the opening 10K, but when placed, the substantially planar main body corresponding to the original crown portion The convex part 12ZT which protruded along the hosel convex part surface is integrally extended | stretched from the part, and the edge line LE of this convex part 12ZT is located in the middle position of the hosel convex part 10ZT. The line LE may be located at the upper end position of the hosel convex portion.

  Further, in this example, the face part side line LF, the toe part side line LT, and the back part side line LB of the periphery of the plate part 12 are respectively shown in FIG. It matches the line of the back and back. After the head main body and the plate part are bonded and bonded, the peripheral edge of the plate part is usually polished or ground as a finish, and the head main body surface is smoothly continued. The gradually decreasing edges also appear in FIGS. This polishing operation is performed over the entire circumference of the plate part. If the peripheral edge of the plate part terminates near the base of the hosel convex part, it is difficult to grind the edge of the plate part, but the peripheral part (edge line) LE of the plate part is If it is integrally extended to the middle position or the end position, the operation of grinding the edge located on the hosel convex portion from the outside becomes easy. Since the polishing is performed before the shaft S is joined, polishing can be performed while rotating the head around the hole center of the hosel hole 10ZTH, and the polishing work is facilitated.

  By using such a gradually decreasing edge, the plate component can easily follow the deformation of the head body at the time of striking, and therefore cracks are less likely to occur at the joint. Further, an edge portion gradually decreasing from the end surface may be formed by applying a putty agent or an adhesive to the peripheral edge surface portion of the plate component and polishing the filling agent portion together with the peripheral edge portion as occasion demands. In this case, when metal powder or the like is mixed into the filling agent, the occurrence of unevenness due to the hardness difference during polishing is prevented, and the appearance is improved.

  7 to 9 show other embodiments according to the present invention. 7 is a plan view of the head, FIG. 8 is a front view, and FIG. 9 is a cross-sectional view taken along line I-I in FIG. The differences from the first embodiment will be mainly described. First, the plate component 12 does not have the projecting convex portion 12ZT, and includes only a substantially planar main body portion corresponding to the original crown portion. Accordingly, as clearly shown in FIG. 7, the hosel side line LE 'extends from the face side line LF to the back part (or heel part). Also in this line LE ', the edge of the part is polished so as to be smoothly continuous with the head body surface. Other matters that are not specially mentioned are the same as in the previous example, for example, the edges along other lines are the same.

  In each of the above examples, most of the peripheral lines of the plate component 12 match each part line of the head main body 10 in a plan view, but they may not match. However, if it matches the lines of the face part, the toe part, and the back part of the head body in plan view, the work of polishing the peripheral part of the plate component 12 becomes easy. For example, the edge of the face part side line LF can be polished in the process of polishing the face part 10F. The same applies to other parts.

  In addition, in the case of the example of FIGS. 1 to 6, the protruding convex portion 12ZT of the plate component 12 is joined to the highly rigid hosel convex portion 10ZT in the case of the example of FIGS. Since it is difficult to deform even when hit, the bonding strength of the plate component 12 to the head body is further improved.

  The present invention can be applied to a hollow wood head including a fairway wood and a utility.

FIG. 1 is an exploded perspective view of a golf club head according to the present invention. FIG. 2 is a plan view of the golf club head after the components of FIG. 1 are joined and the shaft is assembled. FIG. 3 is a front view of the golf club head. FIG. 4 is a rear view of the golf club head. FIG. 5 is a cross-sectional view taken along line EE in FIG. 6 is a cross-sectional view taken along line FF in FIG. FIG. 7 is a plan view of another example golf club head according to the present invention. FIG. 8 is a front view of the golf club head of FIG. FIG. 9 is a cross-sectional view taken along the line II of FIG.

Explanation of symbols

10 Head Body 10K Opening 10U Receiving Part 10ZT Hosel Convex 12 Plate Parts

Claims (2)

In a golf club head having a metal head main body having an opening at the crown of a hollow wood head, and the opening being closed by a fiber reinforced resin plate component with an adhesive interposed between the head main body ,
A golf club head, wherein the head body is bonded to the front surface of the head body and the back surface of the plate part without having a stepped wall surface facing the peripheral edge of the plate part.   2. The head main body has a hosel convex portion that is fixed to a shaft so as to protrude from the surface of the crown portion, and the plate component is integrally extended to an intermediate position or an end position of the hosel convex portion. The described golf club head.

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