WO1992019327A1

WO1992019327A1 - Golf club

Info

Publication number: WO1992019327A1
Application number: PCT/JP1992/000303
Authority: WO
Inventors: Mitsuhiro Saso
Original assignee: Kabushikikaisha Himeji Lodge Hakuba
Priority date: 1991-05-01
Filing date: 1992-03-13
Publication date: 1992-11-12
Also published as: DE69225860D1; EP0537358B1; EP0773046A1; KR930701212A; EP0537358A1; DE69225860T2; TW365179U; CA2086421A1; KR970007191B1; EP0537358A4

Abstract

A golf club for improving the flying distance by removing phenomenon of pulling the shaft occurring as a reaction to phenomenon of prostrated toe liable to occur particularly to a skilled player enjoying a high head speed and further improving the head speed, and for improving the directional stability of a hit ball by removing phenomenon of prostrated toe and changing the design such as in the face resulting therefrom, the golf club being characterized in that the center of gravity of the head is shifted from the toe end to the shaft end by modifying the head shape by decreasing the volume of the head by a certain amount at the toe end on the rear side thereof and increasing the head volume at the shaft end on the rear side by an amount equal to the amount decreased, thereby reducing the rotational radius of the head about a vertical line, as a rotational center line, when the golf club is suspended at the upper end of the shaft thereof. Furthermore, with a metal wood club, a head is provided with a face which comprises a spherical face formed in such a manner that the curvature in the transverse width direction becomes substantially equal to that in the vertical width direction. Moreover, with an iron club, the shape of the back of the face portion is formed by extending the central axis $i(a) of the above hosel substantially to a position where it passes through in the transverse direction, and the increase in thickness of the back of the neck portion is effected by moving a part of the weight at the toe end.

Description

Details:

Golf club

Technical field

The present invention solves the problem of the golf club aiming at improving the stability of the hitting direction and the flight distance, especially the shaft side pulling phenomenon which occurs as a reaction of the toe side fogging phenomenon which is apt to occur to advanced users having a high head speed, and The present invention relates to a golf club that further improves flight distance, improves flight distance, and improves ball hitting direction stability by eliminating fogging phenomena and changing the design of the accompanying face surface and the like.

Background art

Conventional head clubs are not limited to metal heads, but as shown by the dotted line in Fig. 1, the head shape gradually expands from the shaft side to the toe side, and the center of gravity of the head is headed. It is assumed that it is located on the top side from the center of the projection plane, and that the head speed at impact is improved.

On the other hand, in a conventional iron-type club, the back end of the club face is smoothly and smoothly connected to the hosel through the neck when viewed from above, according to the same theory (the dotted line in FIG. 2). A) The center of gravity of the club is set slightly on the toe side.

However, when the center of gravity of the head is located on the toe side, as shown by the two-dot chain line in FIG. 2, when the head B is rotated with the tip A of the club shaft, the vertical line when the head is suspended from the upper end of the shaft is the center of rotation. Head radius of rotation R as a line. As shown in Fig. 3 (a) for metal wood clubs, and for iron clubs, the head toe side is likely to be covered immediately before impact as shown in Fig. 11 (a). The higher the speed, the more likely it is. In order to suppress the hooking phenomenon of the hit ball due to this cover motion, in the metal pad club, as shown by the two-dot chain line in FIG. Eggplant is common. For this reason, the curvature of the face surface in the front-rear width direction and the curvature in the upper-lower width direction are not the same, and the curvature in the upper-lower width direction is usually large.

On the other hand, in iron clubs, the center of gravity of the club is set slightly on the toe side of the clap face, as shown in Fig. 10, so that the downswing speed is faster than that of the beginner. For both the rider and the superior, there is a problem that the toe side of the clap face part is lowered by being twisted at the neck part, so that a 'toe down phenomenon' easily occurs, and so-called 'drifting' tends to occur.

Disclosure of the invention

In view of the drawbacks of conventional club heads, the present inventor has conducted diligent research and, as a result, changed the basic philosophy in head design, and developed a golf club that truly improves the directionality and rejection of the ball. The purpose is to provide a code.

According to the present invention, since the conventional club head has a turning motion characteristic in which the heavy toe side can be pulled first and the light shaft side can be pulled backward in the conventional design concept of the club head, not only the fogging motion but also the It was found that a sink phenomenon occurred on the side of the head, which resulted in a substantial decrease in the head speed.

The main point is that the head profile moves the head toe side rear capacity from the toe side to the shaft side by increasing and distributing the head toe side rear capacity as the shaft side rear capacity, and suspends from the upper end of the shaft. In the golf club, the radius of rotation of the head, in which the vertical line is rotated, is reduced. In order to solve the head fogging phenomenon, it is necessary to not only shift the center of gravity of the head to the shaft than before, but also to prevent the weight balance of the head from being lost. Therefore, it is advisable to adopt a method in which the head shape distributes the head-toe-side rear capacity as the shaft-side rear capacity and increases the head capacity to balance the head weight. As a result, the center of gravity of the head is normally shifted toward the side of the shaft by the moved amount.

According to the present invention, since the center of gravity of the head is located on the shaft side, when the head is rotated with the tip of the club shaft as shown by the solid line in FIG. R. As shown in Fig. 3 (b), the heavier one can be pulled first by increasing the capacity of the head shaft side, and the lighter one can be pulled backward by reversing the swiveling motion. It suppresses fogging movement on the toe side and at the same time suppresses shrinkage phenomena that are likely to occur on the shaft side, thereby improving the head speed at impact and improving the flight distance. Furthermore, the direction of the ball at the time of impact of the golf ball is determined by the curvature of the face surface at the impact position in the vertical and horizontal width directions and the curvature in the front-rear width direction. Although not constant, in the present invention, the curvature in the front-rear width direction and the curvature in the up-down width direction of the face surface can be made equal in designing the metal wood club. That is, in the present invention, since the center of gravity of the head is shifted to the shaft side to suppress the head fogging phenomenon at impact and the sinking phenomenon on the shaft side, the face surface design for correcting the fogging phenomenon is This is unnecessary, and the head surface is formed by a spherical surface having substantially the same front-rear width curvature and front-rear width curvature, and a spherical surface most suitable for impact can be adopted. And at impact Since the head fogging movement is unlikely to occur, the hitting direction is directed to the radial extension line connecting the center C and the impact position as shown in FIG. 4, and the hitting direction stability is excellent.

In applying the present invention to an iron club, it is preferable that the shape of the rear surface 22 of the clap face portion 2 is formed so as to be substantially extended to a position passing through the center axis 镍 a of the hosel 3 in the front-rear direction. (See FIG. 6) In addition, it is preferable to increase the thickness A of the back surface 22 of the neck portion 4 by moving a part of the weight of the toe side B of the club head (see FIG. 8). . As a result, although the design is completely unconventional in terms of the conventional toe-heel balance, the center of gravity is located at the intersection or almost the intersection of the diagonal lines passing through the club face, resulting in an exquisite balance. The return on the toe side is suppressed by 70, and the cause of the hooking can be eliminated (see Fig. 11 (b)). Therefore, it is possible to drive safely. Furthermore, it is possible to increase the thickness of the blade by design, so that a well-pressed ball can be launched.

In addition, as a result of the center of gravity S being located at the intersection or almost the intersection of diagonal lines passing through the clap space, unlike conventional irons, the toe-down that tends to occur at impact can be eliminated (see Fig. 10). The weight distribution for entering and exiting to the heel helps prevent mistakes due to 'pretend'.

Furthermore, in the case of irons, if the club face 2 is designed to be slightly oven at around 1.5 ° at the address, it will have a slight impact on the oven, and will soon become a square, and then a little later. Because the ball returns (see Fig. 11 (b)), the ball can easily delineate the ideal high draw trajectory, and the stability in the direction of the ball is improved.

BRIEF DESCRIPTION OF THE FIGURES FIG. 1 is a plan view comparing the planar shape of a metal head according to the present invention with the planar shape of a conventional metal head. FIG. 2 is a comparison diagram of the swiveling motion of a head club having a metal head according to the present invention and a head club having a conventional metal head. FIG. 3 (a) is an explanatory diagram showing the motion phenomenon before and after the impact of the conventional metal head, and FIG. 3 (b) is an explanatory diagram showing the motion phenomenon before and after the impact of the metal head of the present invention. . FIG. 4 is a perspective view showing a concept of designing a face surface of a metal head according to the present invention. FIG. 5 is a rear view showing a head portion of the iron club according to the present invention. FIG. 6 is a sectional view taken along the line II-II of FIG. FIG. 7 is a schematic perspective view showing the club according to the present invention. FIG. 8 is a rear view of another iron club embodiment. FIG. 9 is a front view showing the position of the center of gravity of the weight distribution design of the present invention. FIG. 10 is a comparative explanatory diagram showing the toe-down phenomenon in the case of the present invention (solid line) and in the case of the conventional club (dotted line). FIG. 11 is a comparative explanatory diagram showing the fogging phenomenon in the case of the conventional iron club (a) and in the case of the iron club according to the present invention (b).

Description of the recommended embodiment

Hereinafter, an embodiment in which the present invention is first applied to a metal pad will be described. FIG. 1 is a plan view showing a projection plane of a metal head according to the present invention based on comparison with a conventional metal head, and a metal head 1 is illustrated as a spherical face 2. This is a hollow structure having a hosel part 3 to be connected to a shaft not to be connected. The weight distribution 11 on the toe side is moved to the rear of the shaft side 12 to bulge out (see the shaded portion), and as a whole, the toe side The region and the shaft side region have a shape that is unevenly distributed from the almost symmetrical shape to the shaft region side as the capacity distribution. Therefore, the center of gravity of the head is G. Not only moves from the shaft side to the shaft side G, but also increases the shaft side volume distribution, A weight distribution that is excellent in suppressing the toe side fogging phenomenon and the shaft side shrinkage phenomenon at the time of impact will be completed.

Further, as shown in FIG. 4, the face surface 2 has the same curvature R in the front-rear width direction and the curvature R in the upper and lower width directions, and forms a part of a true sphere having a radius R centered on C in the figure. The hosel part 3 extends obliquely upward from a position S close to the surface of the sphere, which has been translated from the center of the sphere. Normally, the loft angle of the face surface is in the range of about 9 to 12 °, and the same curvature is adopted in the range of the curvature in the front-rear width direction of 9 to 12 R and the curvature in the upper and lower width directions of 9 to 12 R. Therefore, at the time of impact, the golf pole and the face surface realize a small ball-to-large ball collision, and the direction of the ball is directed in the direction of the radius extension connecting the ball center C and the impact position.

Next, a case where the present invention is applied to an iron club head will be described.

4 to 7 show an iron golf club according to an embodiment of the present invention. In the figure, the club head 101 is formed in a structure in which a club face portion 102 and a hosel portion 103 are integrally connected by a neck portion 104, and the club head 101 is formed. Is integrally manufactured by forging or forging using an iron-based material or a kaburashi-based material, and is polished into a product.

Further, a fixing hole 130 is formed in the hosel portion 103 in the longitudinal direction, a shaft 105 is fitted and fixed in the fixing hole 130, and an upper portion of the shaft 105 is fixed. Is provided with a grip (not shown). The club face section 102 is 1.5 from the square. Faces 120, Sol 1 211 and back side (back) The back side 122 extends substantially to the position passing through the center axis a of the hosel part 103 in the front-rear direction as shown in FIG. It is formed in a shape connected to the portion 103, and the thickness is increased on the back surface 122 of the clap face portion 102, and thus the neck is formed in comparison with the shape of the conventional club head. The part is very small. As a result, the weight of the neck portion is increased, and as shown in FIG. 9, the center of gravity of the club head is located at and near the intersection of the diagonal lines of the face portion.

Therefore, if this club is addressed with this club, even if the club face section 102 is set on a square, it will slightly become an oven in shape. Also, the back side 122 of the club face portion 102 is extended to a position passing through the center axis a of the hosel portion 103, and the neck portion of the conventional club has a bulging shape. In addition, the clap face portion 102 The center of gravity of the club face is located at the intersection of the diagonal lines, the club face part 102 is slightly connected to the heel side, and the golfer swings the club from that state. Impact makes it possible to fly the ball straight without hooking or slicing.

Even if an intermediate or advanced rider performs a downswing at a high speed, the rigidity around the hosel section 103 is high, and the center of gravity of the clapface section 102 is located at the intersection of the diagonal lines, and the heel is slightly heeled. Because it is set to the side, the toe-down phenomenon hardly occurs, and as a result, so-called 'drifting' does not occur and the impact can be made smoothly.

Industrial applicability

According to the present invention, it is possible to suppress the fogging movement on the head toe side immediately before impact, which is likely to occur particularly in advanced users having a high head speed, and It suppresses the shrinkage phenomenon that is likely to occur on the shaft side, which is the reaction, which leads to a further improvement in the head speed at impact and an improvement in the flight distance.

In addition, metal wood clubs have the same curvature in the front-to-rear width direction and the curvature in the upper and lower width directions on the face surface. Further improve the score of the superior.

In iron clubs, the head toe side fogging movement immediately before impact, which is more likely to occur for advanced users with high head speeds, is suppressed, eliminating the cause of hooking and enabling driving with peace of mind. Unlike irons, the toe-down that tends to occur at impact can be eliminated, the weight is distributed to enter and exit the heel, and mistakes due to 'drifting' can be prevented. You will be able to launch a crisp ball. Furthermore, if the club face part 2 is designed to be slightly oven at around 1.5 ° when addressing, it will have a slight impact on the oven, and it will become a square immediately afterwards, and then the head will return little by little. Since it is easier to delineate the ideal trajectory of the hydro (see Fig. 11 (b)), the ball has excellent stability in the hitting direction and further improves the score of advanced players.

Claims

Claim range

(1) The head shape moves the head-to-shaft side from the toe side to the shaft side by increasing and distributing the head-to-side rear capacity as the shaft-side rear capacity. A golf club characterized in that the radius of rotation of the head, which is the center of rotation, is reduced.

(2) The golf club according to claim 1, further comprising a metal head club, wherein the face surface of the metal head club forms a spherical surface whose front-rear width direction curvature and upper and lower width direction curvature are substantially the same. .

(3) An iron club, in which the back surface of the face portion is formed substantially extending to a position S passing in the front-rear direction through the center axis a of the hosel, and increasing the thickness of the back surface of the neck portion to the club head. 2. The golf club according to claim 1, wherein a part of the toe side weight is moved.

(4) The iron-type golf club according to claim 3, wherein the face surface is formed so as to be slightly an oven during dressing.