JP2004351054A - Metal hollow golf club head - Google Patents

Abstract

Provided is a metal hollow golf club head capable of producing a flight distance similar to that when hitting with a golf club head having a smaller loft angle when hitting, although the loft angle actually looks large when standing. .
An area δ near the face portion 10 of the crown portion 12 is formed more easily in the thickness direction of the wall portion than the rear portion thereof, and is formed at the intersection of the face portion and the sole portion 14. It has a bent part Z, the wall of the sole part is directed to the back side continuously to the bent part, and the bent part is on the back side compared to the sole part against hitting on the face surface It is configured so as to be easily deformed backward.
[Selection] Figure 3

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a metal hollow golf club head.
[0002]
[Prior art]
For golfers who are making progress, when they set up a golf club, there is a concern that it is difficult for the golf club with a small loft angle to hit the ball. In order to counteract such anxiety, Patent Document 1 below discloses a golf club head that appears to have a large loft angle in an iron golf club head.
In addition, Patent Document 2, Patent Document 3, and Patent Document 4 below disclose golf club heads in which the inclination angle of the face surface changes during hitting in order to extend the flight distance of the ball. Document 2 is a golf club head made of fiber reinforced resin, and the crown portion has a lower rigidity than the sole portion. In Document 3, 4 is a metal golf club head, and the crown portion has a lower rigidity than the sole portion.
[Patent Document 1]
Japanese Utility Model Publication No. 61-136766 [Patent Document 2]
JP-A-4-89071 [Patent Document 3]
JP-A-4-135576 [Patent Document 4]
Japanese Patent Laid-Open No. 9-103522
[Problems to be solved by the invention]
However, since the document 1 devises the upper part of the face (which can also be regarded as the top part), the loft angle of the face surface part where the ball is actually hit is as set, and thus anxiety is largely avoided. Is difficult. Further, Documents 2 to 4 make the crown part low in rigidity compared to the sole part and extend the flight distance.
Therefore, the present invention is a metal hollow golf club that can have a flying distance similar to that when hitting with a golf club head having a smaller loft angle when hitting, although the loft angle actually looks large when set. The purpose is to provide a head.
[0004]
[Means for Solving the Problems]
In view of the above object, in claim 1 of the present invention, the region near the face portion of the crown portion is formed more easily in the thickness direction of the wall portion than the rear portion, and the face portion and the sole portion are formed. The intersecting part has a bent part, and the wall of the sole part is directed to the back side in succession to the bent part, and the bent part is compared with the sole part against hitting the face surface. Provided is a metal hollow golf club head that is easily deformed backward toward the back side.
The region near the face portion of the crown portion preferably has a width of about 5 to 30 mm.
[0005]
When the face surface is hit, the area near the face portion is bent in the crown portion, while the bent portion at the intersection of the face portion and the sole portion is deformed backward (quantitatively). Small, but for example, it typically folds into a bellows-like fold). For this reason, if simplified, the face portion rotates in the vicinity of the upper end portion, and the inclination angle (loft angle) of the face surface is reduced so that the lower end portion is drawn into the backward deformation of the bent portion. Change.
In other words, when set up, the loft angle is larger than that at the time of hitting, so that a sense of security can be obtained, and it can be used as a golf club head with a smaller loft angle at the time of hitting, and the inclination angle of the face surface is changed to be small By doing so, it is possible to reduce the excessive backspin amount corresponding to the loft angle that is too large in normal times (except when hitting) provided for a sense of security, and to increase the flight distance.
[0006]
In claim 2, the bent portion is formed by connecting a first wall portion toward the rear side and a second wall portion continuous with the second wall portion in a direction away from the crown portion, or a plurality of sets thereof. The metal hollow golf club head according to claim 1, wherein the sole portion is continuous with the second wall portion at the end of the bent portion.
Since the sole portion continues to the back wall side of the second wall portion at the end of the bent portion, the sole wall moves downward with respect to the face portion due to the presence of the second wall portion in the bent portion. positioned. Accordingly, the center of gravity of the head is lowered correspondingly, and the sweet spot is lowered. Further, since the bent portion is adjacent to the face portion (closer to the face portion), the center of gravity of the head is moved closer to the face portion mainly by the weight of the second wall portion, and the sweet spot is also lowered by the influence. As described above, the backspin amount can be reduced and the flight distance can be increased by changing the position of the sweet spot in addition to the change of the inclination angle of the face surface when hitting.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in more detail based on an embodiment shown in the accompanying drawings.
FIG. 1 is a front view of a metal hollow golf club head according to the present invention, FIG. 2 is an end view taken along line B of FIG. 1, FIG. 3 is a cross-sectional view taken along line CC of FIG. FIG. 5 is an enlarged view of the vicinity of the bent portion in FIG. 3, FIG. 5 is an end view taken along line E of FIG. 1, FIG. 6 is a top view, and FIG. As an example, this hollow golf club head is entirely made of a titanium alloy. A face portion 10 on the front side of the head having a face surface, a crown portion 12 as an upper surface portion, a sole portion 14 as a lower surface portion, a toe portion 16 as a tip portion, a heel portion 18 as a front portion, and a front surface A back part 20 that is a rear part from the face part, a bent part Z of the characteristic part of the present invention that connects the face part and the sole part, and a hosel part H in the crown part. Is formed. Furthermore, in this example, a rib R extending in the front-rear direction is formed inside the crown portion.
[0008]
The lower end portion (sole side end portion) of the face portion 10 has a first wall portion Z1 that faces the rear side, and a second wall portion Z2 that is continuous with the second wall portion Z2 in a direction away from the crown portion 12 (downward direction). And the wall of the sole part 14 continues to the lower end part of the second wall part and faces the back part side. On the other hand, a boundary line between the face portion 10 and the crown portion 12 is indicated by L1.
[0009]
The head main body portion is a cast product of α-β type titanium alloy “Ti-6Al-4V”, and the face portion 10 is a rolled material of β-type titanium alloy “Ti-15Mo-5Zr-3Al”. Further, the following bent portion may be the same material as the head main body, may be integral with the face portion, may be integral with the face portion, or may be separate. In particular, a high-strength titanium alloy such as Ti-4.5Al-3V-2Mo-2Fe or Ti-15V-3Cr-3Sn-3Al that is integrated with the face portion is molded by plastic working such as forging. Since the strength can be reduced and there is no welded portion, there is an effect of easily increasing the amount of deformation of the bent portion.
[0010]
These parts are joined by welding, and can be selected from TIG welding, plasma welding, and laser welding. Further, the head main body may be made of a plurality of parts by welding. In particular, when the bent portion and the face portion are welded, beads accumulate at the corners of the lower end of the face portion and the first wall portion Z1 to reduce the backward deformability (foldability) of the bent portion. Therefore, laser welding that allows easy control of the weld bead amount is preferable.
[0011]
The angle θ1 formed by the inner surface of the first wall portion Z1 and the face portion 10 and the angle θ2 formed by the outer surface of the first wall portion Z1 and the second wall portion Z2 are both small angles (at least acute angles). It is preferable to improve folding performance against impact, and at least one of the angles is preferably an acute angle. The same applies to a bent portion in which a plurality of first wall portions and second wall portions are connected. In the present application, the boundary portion between the crown portion 12 and the face portion 10 indicated by the line L1 is deformed so that the face portion 10 rotates around the boundary portion as a pivot (or fulcrum) at the time of hitting. Ribs R extending in the front-rear direction are provided on the inner surface to prevent overall buckling deformation.
[0012]
The front end position of the rib R is separated from the inner corner of the boundary portion of the line L1. The spreading surface of the rib-free region is continuous with the rear crown portion without being greatly bent, and only the δ region is easily bent. The separation distance δ is preferably 5 to 30 mm. Even if the shape of the boundary portion is rounded and the line L is unknown, if the material of the crown portion and the face portion is different, the boundary is the line L, and if the material is the same, each surface of the crown portion and the face portion Let be a smoothly extended line to intersect. The reason why the thickness is 5 mm or more is that if it is less than 5 mm, this δ region becomes too short and stress at the time of hitting is concentrated, resulting in a problem in durability. The reason why the thickness is 30 mm or less is that if it exceeds 30 mm, the crown portion is buckled, and it is difficult to obtain a hinge-like deformation (a bending deformation of the δ portion). Further, the face portion 10 is thicker than the crown portion or the like, and is hardly deformed as compared with the deformation of the region δ and the bent portion Z.
[0013]
An example of numerical values such as the plate thickness of the main part is shown. The plate thickness Ct of the crown portion is 0.85 mm, the face plate thickness Ft is 2.4 to 2.7 mm, the sole plate thickness St is 1.1 to 1.4 mm, and the first wall thickness Zt is 1.2. The second wall thickness Z2t is 1.2 to 1.8 mm. Further, the width Δ1 of the first wall portion is 6 to 9 mm, and the width Δ2 of the second wall portion is 5 to 8 mm. Furthermore, the angle θ1 and the angle θ2 are 30 to 120 degrees, preferably 60 to 90 degrees, and here, an example of 70 to 88 degrees that is more easily deformed is taken. Preferably, the angle θ3 is the same as these angles.
[0014]
Also, it is preferable to provide several ribs R having a height of about 0.6 to 0.8 mm and a width of about 1.5 to 2.0 mm. Furthermore, in order to increase the rigidity of the crown portion other than providing ribs, the wall thickness may be simply increased, but it is easier to reduce the weight by providing ribs. There is also a method of attaching a fiber reinforced resin material using carbon fibers as reinforced fibers. Also in this case, since the basic portion is metal, it is the metal golf club head of the present application, which has an effect that the weight increase is small and the center of gravity is easily designed at the intended position. Furthermore, since the lower end of the second wall portion Z2 is located behind the lower end position of the face portion, the bent portion cannot be seen from above when holding the club when hitting the ball, and does not disturb the golfer.
[0015]
Due to the above structure, for example, the tilt angle of the face portion 10 is changed so that the vicinity of the upper end portion L1 is hingedly rotated and the lower portion is retracted toward the back portion side. The state after this deformation is schematically shown by a two-dot chain line 10 'in FIG. In order for the face portion to be more easily hingedly rotated in the vicinity of the upper end portion, the boundary line L1 with the crown portion is made linear. That is, in the front view of FIG. 1 and the top view of FIG. 6, the face portion 10 becomes easier to rotate as the line L1 is closer to a straight line.
[0016]
Further, as will be described with reference to FIG. 3, in the conventional hollow golf club head, the wall portion in the state of extending to the back side at the position of the first wall portion Z1 is the sole portion. In contrast, in the present invention, the center of gravity of the sole portion 14 is lowered mainly due to the presence of the second wall portion Z2 extending downward from the lower end of the face portion 10. Therefore, the sweet spot is lowered. Further, the bent portion Z is adjacent to the face portion, and the center of gravity moves forward (near the face portion) mainly by the weight of the second wall portion Z2. The sweet spot also falls under the influence. By lowering such a sweet spot and reducing the loft angle as described above, the backspin amount at the time of hitting is reduced. That is, the backspin amount that is excessively large due to the tilt angle of the face surface that has been excessively inclined to obtain a sense of security is adjusted so as to reduce the flight distance.
[0017]
FIG. 8 is a cross-sectional view of another embodiment of a hollow golf club head according to the present invention. The difference from the previous example is that the sole portion 14 is located at the lower end position of the face portion 10, and the center of gravity of the head does not substantially drop even if the bent portion Z exists. However, since the bent part is close to the face part, it is the same that the center of gravity moves forward, and the sweet spot is lowered accordingly. Note that the smaller the angle formed by each wall portion of the bent portion, the easier the backward deformation and the more preferable. Other matters are the same as in the previous example.
[0018]
【The invention's effect】
As is apparent from the above description, according to the present invention, the loft angle actually looks large at the time of holding, but at the time of hitting, the same flight distance as hitting with a golf club head having a smaller loft angle It is possible to provide a metal hollow golf club head capable of producing
[Brief description of the drawings]
FIG. 1 is a front view of a hollow golf club head according to the present invention.
FIG. 2 is an end view taken along line B of FIG.
FIG. 3 is a cross-sectional view taken along line CC of FIG.
4 is an enlarged view of the vicinity of a bent portion in FIG. 3;
FIG. 5 is an end view taken along the line of sight E in FIG. 1;
FIG. 6 is a top view of FIG. 1;
7 is a bottom view of FIG. 1. FIG.
FIG. 8 is a cross-sectional view of another embodiment of a hollow golf club head according to the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Face part 12 Crown part 14 Sole part Z Bending part Z1 1st wall part Z2 2nd wall part

Claims (2)

A region near the face portion of the crown portion is formed to be more easily bent in the thickness direction of the wall portion than the rear portion thereof, and has a bent portion at the intersection between the face portion and the sole portion, The wall of the sole part faces the back side continuously to the bent part, and the bent part is easy to be deformed backward toward the back side compared to the sole part when hitting the face surface. Metal hollow golf club head. The bent portion is formed by connecting one set or a plurality of sets of a first wall portion that is directed rearward and a second wall portion that is continuous with the second wall portion and is away from the crown portion, and the sole portion is bent. The metal hollow golf club head according to claim 1, wherein the metal hollow golf club head is continuous with the second wall portion at the end of the portion.

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