JPS6085769A - Wood club head for golf - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the head of a golf wood club, and by devising the curved shape of the face surface of the head body, it is possible to correct the rotation of the ball in the horizontal direction due to a mis-shot, and to improve the accuracy of the ball. This is to stabilize the direction.

In a conventional club head of this kind, as illustrated in FIGS. 1 and 2, the face surface 1a of the head body 1 is arranged vertically and horizontally. The radii of curvature R1 and 1 (2) are usually equal to each other.

In such a love head, as shown in Fig. 2, the horizontal direction of the face surface of the head body 1 is formed into a bulge curved surface. When you hit a ball at the missed off point 91~ position, create a squeak effect between it and ball B, and consciously give the ball a hook rotation or slice rotation ("t I"). to the target point, and the moment of inertia (approximately 2.00 (Ig
・Using Cm2), the ball is given hook rotation or slice rotation in the opposite direction due to the bulge curved surface at the moment it hits the face surface, which has the effect of making the ball fly straight to the target point.

However, as shown in FIG. 1, since the face surface 1a of the head body 1 is a spherical surface, it also has a roll curved surface in the vertical direction. .

For example, when the head body 1 hits an off-spot position that is off to the sole side, the head body 1 rotates 5 times! ! However, this vertical moment of inertia is smaller than the above-mentioned horizontal moment of inertia at approximately 1,200g・C1, and the rotation angle is also large, so the loft angle of the face of the head body changes in a negative direction. Although the launch angle of the ball is further reduced and the ball is launched with a lower trajectory, and backspin is imparted to ball B by the gear 11 effect between the ball and the face surface, for a general golfer who is not strong enough, Since the hitting speed of the head is small (t=), it is impossible to expect the ball B to float due to the strong backspin effect that professional golfers have, and as a result, the flight distance is significantly reduced. It can be seen that the vertical roll curved surface formed on the face surface is unnecessary.

Furthermore, as shown in FIG. 3, the inventor proposed that the harmful horizontal rotation caused by the gear effect at each point of the ball hitting the face surface 1a of the head body 1, that is, the hook rotation that causes leftward spin, is '', the slice rotation that spins to the right is ``-'', and the size of the circle surrounding + and - is displayed as the size of the rotation.Assuming that it is covered, calculate its direction and amount at various points. As a result of various studies by plotting the results in a diagram, the boundary line a-a between the hook rotation "-to" and the slice rotation "-" is located at the shaft axis S-8.
It tilts to the side, and as a result, the rotational movement of the head body around the center of gravity in the horizontal direction due to the impact when hitting the ball,
It was detected that instead of rotating around a straight line perpendicular to the sole surface passing through the center of gravity, the rotational axis was a straight line tilted toward the shaft axis S-8, that is, a straight line parallel to boundary line a-a. , Moreover, since the rotation of the ball due to the gear effect is vertical on the boundary line a-a, there is no need to form a face surface on the horizontal bulge curved surface, and as a result, the boundary line a-a a How can I get away from b?
He proposed that a curved surface that requires a lot of correction, that is, a cylindrical curved surface, is suitable for the face surface, and completed this invention. By forming a cylindrical curved surface with a curvature in the almost horizontal direction, and by tilting the central axis of the cylindrical shape in the range of θ to 45 degrees with respect to the sea knot axis, the ball's off-spot position during the first pitch can be improved. This is designed to stabilize the trajectory and improve flight distance.

Next, the present invention will be explained based on an embodiment shown in FIG. 4 and subsequent figures.

As shown in FIGS. 4 to 6, reference numeral 10 in the figures indicates the head body of the golf wood club according to the present invention, and the face surface 1
A face plate 11 is provided at 0a. The face plate 11 is formed into a cylindrical curved surface with a radius of curvature R of 200 to 500 I in the horizontal direction, and the central axis X of the cylindrical shape
-X has a configuration in which it is inclined at an angle θ of 0 to 456 degrees, preferably 0 to 25 degrees, with respect to the shaft axis S-8.

According to the configuration according to the present invention described above, the head main body 10
The face surface 10a has a curvature in the horizontal direction, but has a cylindrical bulge curved surface that is flat in the vertical direction, so even if the ball is hit off-spot, it will not be a so-called 1 heel ball or a so-called tempura ball. When a ball is hit on the 1-U side or the heel side of the ball surface, the angle of inclination of the cylindrical central axis Since correction can be made by adjusting θ, it becomes possible to hit the ball with a stable trajectory as shown in 1).

By the way, in this invention, if the face plate 2 (l Om) of the head main body is less than 500 mm, the curve of the ball's trajectory will be corrected more than an appropriate amount, which will actually increase the instability of the ball's launch direction; In this case, the curved surface becomes close to a flat surface, so it is not effective in correcting the curve of the ball's trajectory, and if the head has a small moment of inertia,
Since the amount of rotation in the horizontal direction is large, the radius of curvature is decreased to increase the amount of correction, whereas for a head with a large moment of inertia, the radius of curvature is conversely increased to decrease the amount of correction. Roughly speaking, the central axis of a cylindrical shape that forms a bulge curved surface ×−
If the inclination angle θ of

As explained above, in this invention, the face surface of the head body is formed into a cylindrical curved surface whose curvature is rightward in the almost horizontal direction. For a 4'' ball, it is possible to correct the curve in the trajectory of the ball and obtain a stable trajectory, so it is possible to improve the flight distance of the ball, and has outstanding effects in terms of practicality.

[Brief explanation of drawings]

Figures 1 and 2 are explanatory diagrams showing the hitting characteristics of a conventional wood club head at the off-spot, Figure 3 is an explanatory diagram showing the direction and amount of rotation of the ball at the off-spot, and Figure 4 FIG. 6 is an explanatory section showing embodiments of a wood club head according to the present invention. 10...Head body, 10a...Face surface, X
-X...Cylindrical central axis, S-8...Shift shaft special ¥1 Applicant: Nippon Gakki Seizo Co., Ltd. Procedural Netli Official Book Showa 60'41 May 170 1, Incident Indication 1988 Patent Application No. 194920 2, Name of the invention: Golf club head 1: 3. Relationship to the case of the person making the amendment Applicant's name (name) (407) Nippon Gakki Mfg. Co., Ltd. 4, Agent address: Port of Tokyo No. 1-1, Minami-Aoyama-ku (Date of dispatch) Month, Day 6, 1939, Subject of amendment 7, Contents of t+l1ilT (1) The scope of the claims will be amended as shown in the attached sheet. (2) Insert the following text between lines 3 and 4 on page 4 of the specification. Note I: In view of the above circumstances, the shape of the face of the club head has been changed to a cylindrical circumferential shape. However, in order to realize such a shape, how large should the curvature of the cylinder be, and which direction should the center of the cylinder that covers A3 and the other direction be set? The specific specifications, such as whether the Delete Juru (4
) l'iF] Page 4 2 Part 4 20 Delete "may be...". (5) Delete "(5 has a curvature in the horizontal direction") in line 5 and 9 of the same. (6) Delete "(has a curvature in the horizontal direction)" in line 5 and 20 of the same. (7 ) Insert the following text between lines 4 and 5 on page 6 of the same page. In the projection view formed when the horizontal plane and the sole surface contact J:, the contact line formed by the straight line is defined as M, and the projection line of the shaft axis onto the horizontal plane is defined as M, and the L line is defined as If the intersection point of the M line is 0, and the vertical line from the 0 point to the horizontal plane is N, then its Lll
and a slope angle α of 7 to 20' loft angle as shown in FIG. Here, the sill left axis is indicated as a straight line parallel to the straight line OQ having an inclination angle β of 0 to 45°. (See Figures 7, 8, and 9) (8) Page 6, lines 6 to 8
・Delete j which becomes a flat surface. (9) Line 1/1 of the same No. 6, [correction 1 [because it can be done,] is corrected, so it is corrected. 2. Scope of Claims (1) A wood club head for golf in which the face surface of the head body is formed into a cylindrical curved surface (2. In the wood club head for golf according to claim 1, the radius of curvature of the face surface of the head body is 200-500m
A head characterized by having an m shape.

Claims (1)

[Scope of Claims] (1) A wood club head for golf in which the face surface of the head body is formed into a cylindrical curved surface having a curvature in a substantially horizontal direction. (2. In the golf wood club head according to claim 1, the radius of curvature of the face surface of the head body is set to 200 to 500 m.
A head characterized by having an m shape. (3) A golf golf club in which the face surface of the head body is formed into a cylindrical curved surface with a curvature right in the almost horizontal direction, and the central axis of the cylindrical shape is inclined in the range of 0 to 45 degrees with respect to the shirt axis. Wood club head.