JPH01218472A - Shaft of golf club - Google Patents

Abstract

PURPOSE: To improve the hitting direction yet increasing the hitting speed by making the shaft to have an oval cross-section so that the direction of the major axis is parallel to the direction perpendicular to the hitting face at the center thereof. CONSTITUTION: Shaft 1 has an oval cross-section 10 defined by the major axis radius R and the minor axis radius (r) having a predetermined ratio therebetween, and head 2 is attached to shaft 1 so that the direction of the major axis radius R parallel to the direction perpendicular to the face 2a of head 2 at the center thereof. It is possible to swing the shaft at high speed in a predetermined direction and in a good direction due to the reduction of eddy currents 25 by the low air resistance 24 derived from the stream lined cross-section of shaft 1. When the ratio between the major axis radius and the minor axis radius falls within 1 < major axis radius/minor axis radius < 4, practical shaft is obtained and the air resistance and twisting of the shaft is effectively reduced.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a shaft for a golf club, and in particular, the shaft has a substantially elliptical cross-section, and a shaft that has a substantially elliptical cross-section, and a shaft that has a substantially elliptical cross-section and a vertical direction along the center of the face, which is the hitting surface. Concerning the shaft of a golf club where the two are parallel.

[Prior Art] As shown in FIG. 8, a conventional golf club is composed of a grip (2), a shaft (21), and a head (n). In particular, the shaft (211) has a large diameter at the top and bottom ends, a small diameter at the center, and is formed into a cylindrical shape with a slightly narrower center, so it is not suitable for swinging a golf club. It is now possible to add impact to the golf ball by giving it a different shape.

FIG. 9 is a cross-sectional view of the main part taken along the line ■-■ in FIG. 8, and the conventional shaft +211 has a perfect circular cross section.

[Problem to be solved by the invention] However, since the conventional shaft (2B) has a perfect circular cross section, it is susceptible to air resistance Q4, and there is a thin air flow around the shaft Qυ. This causes the shaft (21) to swing in the wrong direction.Furthermore, with the exception of butter, the head of the shaft (21)
1) Since it protrudes only in one direction from the lower end, when the shaft bends, twisting inevitably occurs, and the center vertical direction A of the face (22a), which is the striking surface of the head, In general, the twist direction B has shifted outward by the twist angle θ.

This is the cause of beginner golfers hitting the ball in the opposite direction even though they thought they had hit the ball just right.
Immediately before the player (a) hits the ball, he twists in the opposite direction from his waist to his wrists to correct the twist angle θ.

The present invention was developed against the background of the above-mentioned circumstances, and provides a golf club shaft that reduces air resistance to the shaft and eliminates twisting that occurs when the shaft bends, allowing even beginners to make accurate shots. The purpose is to provide.

[Means for Solving the Problems] The above object is to provide a shaft for a golf club in which the cross-sectional shape of the shaft is a non-perfect circle formed by a major axis R and a minor axis r within a specific ratio range, The direction of the major axis R is parallel to the center perpendicular direction of the face, which is the ball striking surface of the head of the golf club, and at least two continuous arcs are provided at at least one end of the major axis R, and these arcs sandwich the major axis R oppositely. This can be achieved by a golf club shaft characterized in that the continuous arc is integrally continued at one oval end.

Further, the ratio of the major axis R to the minor axis r is 1<"-<4
It is desirable that the ratio be covered within the specified ratio range.

[Function] The shaft of the golf club of the present invention has a substantially elliptical cross section, and the center perpendicular direction, which is the hitting direction of the face, is parallel to the longer diameter direction of the shaft. This eliminates the twist that occurs when the shaft bends, allowing even beginners to shoot in the correct direction.

Furthermore, since air resistance is reduced and air eddies are less likely to occur, the hitting direction will not go awry, and at the same time, the swing speed of the golf club can be increased.

[Examples] Hereinafter, preferred embodiments of the present invention will be described based on the drawings.

FIG. 1 is a side view of a main part showing a first embodiment of the present invention, and FIG. 2 is a sectional view of the main part taken along line IA-1A in FIG.

In FIG. 1, a golf club in which the shaft of the present invention is implemented includes a shaft (1), a head (2) fixed to the lower end of the shaft (1), and a head (2) connected to the upper end of the shaft (1). It consists of a grip (3).

Similar to the prior art, the shaft (1) of the first embodiment has a cylindrical shape with a small diameter in the center and a constricted shape in order to make it easy to bend.
In 2), a face (2a) for hitting a golf ball is provided.

In FIG. 2, the cross section of the shaft (1) is an ellipse formed by a major axis R and a minor axis r within a specific ratio range, and the major axis direction is the face (2a) of the head (2).
The head (2) is fixed so as to be parallel to the center vertical line direction of ), and connecting arcs (2) and 02) are formed that sandwich both ends of the major axis R from the top and bottom directions in the figure, respectively.
In addition, one elliptical end portion is provided between these connecting arcs (old) and 02), thereby forming an integrally continuous elongated circumferential surface.

Therefore, in FIG. 1 and FIG. 2, when the golf club is swung and the shaft (1) receives air resistance Q4, the cross section (end) of the shaft (1) has a streamlined shape with less air resistance Q4. Therefore, the shaft (
1) Since the ball can be swung without twisting, the ball can be shot in the correct direction.

FIG. 3 is a sectional view of a main part showing a second embodiment of the shaft according to the present invention.

In FIG. 3, the cross section (tOa) is an ellipse with a major axis R1 and a minor axis "1" within a specific ratio range, and the direction of the major axis R1 is the face (2) of the head (2).
2a) parallel to the center vertical line direction A (see FIG. 1). In addition, connecting arcs (lla) and (1
2a) is formed, and the connecting arcs (lla), (
12a) Oval end portion (13a) provided at the connection site between
It is an integrally continuous oblong circumferential surface.

FIG. 4 is a sectional view of a main part showing a third embodiment of the shaft according to the present invention, and the cross section (10b) has a substantially elliptical shape with a major axis R2 and a minor axis r2 within a specific ratio range. At the same time, the direction of the major axis R2 is parallel to the center perpendicular direction A of the face (2a) of the head (2) (see FIG. 1). In addition, connecting arcs (llb), (12
b) are formed, and these connecting arcs (llb), (
Since another connecting arc 04) is interposed between 12b), the oval end portion (13b) becomes a connecting surface with a concave chevron shape.

FIG. 5 is a cross-sectional view of a main part showing a fourth embodiment of the shaft according to the present invention, in which the cross section (toe) extends in the direction of the major axis R3 within the specific ratio range with the center perpendicular direction A of the face (2a). In addition to making them parallel (see Figure 1), connecting arcs (llc) and (12c) are provided at one end of the major axis R3 to form a continuous surface at the oval end (lie), and at the same time, at the other end of the major axis R3, A large-diameter connecting arc-1 (g) is provided, and a continuous surface is formed by the larger-diameter elliptical end (to).

By the way, in the above-mentioned first to fourth embodiments, when the major axes Rs R+, R2, R3 and the minor axes r1 are within the range, it is possible to manufacture a shaft with sufficient practicality, and also to reduce air resistance and torsion. can be effectively reduced. Outside the above specific ratio range, air resistance increases or twist cannot be effectively eliminated, making it impossible to manufacture a golf club with practicality.

FIG. 6 is a side view of a main part showing a fifth embodiment of the shaft according to the present invention, and FIG. 7 is a sectional view of the main part taken along the line 5A-5A in FIG.

In these FIGS. 6 and 7, the shaft (1) of the fifth embodiment is implemented in an iron.゛Although the first to fourth embodiments are directed to wood, as is clear from the above description, the shaft of the present invention (1
) can be performed regardless of the type of golf club, such as wood, iron, or putter. Further, the material of the shaft (1) may be metal or non-metal, and carbon graphite, for example, is a suitable shaft material.

[Effects of the Invention] The shaft of the golf club according to the present invention has a substantially elliptical cross section formed by a major axis R and a minor axis within a specific ratio range, thereby reducing air resistance and air eddies. Since the occurrence of flow is significantly reduced and the deviation in the direction of swing of the golf club is reduced, even beginners can hit the ball more accurately and at the same time can improve the swing speed.

In addition, since the shaft of the present invention has the long axis R direction parallel to the center vertical line direction of the face of the head, twisting can be effectively prevented from occurring, and special techniques or skills are not required. You will be able to make accurate shots and bats without any problems.

[Brief explanation of the drawing]

Fig. 1 is a side view of the main part showing the first embodiment of the present invention, Fig. 2 is a sectional view of the main part taken along line FA-IA in Fig. 1, and Fig. 3 is the main part showing the second embodiment of the invention. 4 is a sectional view of a main part showing a third embodiment of the present invention, FIG. 5 is a sectional view of a main part showing a fourth embodiment of the invention, and FIG. 6 is a sectional view of a main part showing a fifth embodiment of the invention. FIG. 7 is a sectional view of the main part taken along the line 5A-5A in FIG. 6, FIG. 8 is a side view of the main part showing a conventional golf club, and FIG. ■It is a sectional view of the main part along the line. (Main symbols in the drawings) (1): Shaft (2) Two heads (23: Golf ball (Figure 3, Figure 4)

Claims (1)

[Scope of Claims] 1. A shaft for a golf club, in which the cross-sectional shape of the shaft is a non-perfect circle formed by a major axis R and a minor axis r within a specific ratio range, in which the major axis R direction is At least two connecting arcs are provided that are parallel to the center vertical line of the face, which is the ball-striking surface of the club head, and that sandwich the long axis R oppositely at at least one end of the long axis R, and these connecting arcs are combined into one long axis. A golf club shaft characterized in that the circular end portion is integrally continuous. 2. The golf club shaft according to claim 1, wherein the ratio of the major axis R to the minor axis r falls within a specific ratio range of 1<R/r<4.