GOLF CLUB AND GOLF CLUB SET

• US 20170259131A1
• Filed: 02/27/2017
• Published: 09/14/2017
• Est. Priority Date: 03/11/2016
• Status: Active Grant

• Current Assignee: Sumitomo Rubber Industries Limited
• Original Assignee: Dunlop Sports Co. Ltd. (Sumitomo Rubber Industries Limited)
• Inventors: SHIMAHARA, Yuki
• Granted Patent: US 9,878,219 B2
• Time in Patent Office: Days
• CPC Class Codes: A63B 53/005 Club sets
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/047 iron-type

Abstract

A golf club 4 includes a head hd and a sole surface 12. The sole surface 12 includes a ridgeline RL extending from a toe side toward a heel side, a leading surface Si positioned on a face side of the ridgeline RL and inclined upward toward the face side, and a trailing surface S2 positioned on a back side of the ridgeline RL and inclined upward toward the back side. Inclination angles at respective positions of the trailing surface S2 are defined as θ2c at a central position, θ2t at a toe reference position, and θ2h at a heel reference position. Then, the head hd satisfies at least one of the following (a) and (b):

• • (a) The inclination angle θ2t is greater than the inclination angle θ2c
  • (b) The inclination angle θ2h is greater than the inclination angle θ2c.

Claims

1. A golf club comprising:

a shaft;

a head attached to a tip part of the shaft; and

a grip attached to a rear end part of the shaft,

wherein;

the head includes a sole surface and a face surface having a face line;

the sole surface includes a ridgeline extending from a toe side toward a heel side, a leading surface positioned on a face side of the ridgeline and inclined upward toward the face side, and a trailing surface positioned on a back side of the ridgeline and inclined upward toward the back side; and

if an inclination angle of the trailing surface is defined as θ

2;

the inclination angle θ

2 at a central position of the face line is defined as θ

2c;

the inclination angle θ

2 at a toe reference position is defined as θ

2t; and

the inclination angle θ

2 at a heel reference position is defined as θ

2h,

the golf club satisfies at least one of the following (a) and (b);

(a) the inclination angle θ

2t is greater than the inclination angle θ

2c;

(b) the inclination angle θ

2h is greater than the inclination angle θ

2c.

2. The golf club according to claim 1, wherein the golf club satisfies both the following (a) and (b):

(a) the inclination angle θ

2t is greater than the inclination angle θ

2c;

(b) the inclination angle θ

2h is greater than the inclination angle θ

2c.

3. The golf club according to claim 1, wherein a trailing edge which is a rear edge of the trailing surface is curved so as to project toward the face side.

4. The golf club according to claim 1, wherein a width of the trailing surface is greater than a width of the leading surface at all positions in a toe-heel direction.

5. The golf club according to claim 1, wherein the head is an iron type head.

6. A golf club set constituted by the golf clubs according to claim 1, and comprising the two or more golf clubs having different loft angles,

the golf club set satisfies at least one of the following (c) and (d):

(c) the inclination angle θ

2t is increased as the loft angle is increased;

(d) the inclination angle θ

2h is increased as the loft angle is increased.

7. The golf club set according to claim 6, wherein the golf club set satisfies both the following (c) and (d):

(c) the inclination angle θ

2t is increased as the loft angle is increased;

(d) the inclination angle θ

2h is increased as the loft angle is increased.

8. A golf club set constituted by the golf clubs according to claim 1 and comprising the two or more golf clubs having different loft angles,

wherein if a difference (θ

2t−

θ

2c) between the inclination angle θ

2t and the inclination angle θ

2c is defined as a toe angle difference, and a difference (θ

2h−

θ

2c) between the inclination angle θ

2h and the inclination angle θ

2c is defined as a heel angle difference, the golf club set satisfies at least one of the following (e) and (f);

(e) the toe angle difference is increased as the loft angle is increased;

(f) the heel angle difference is increased as the loft angle is increased.

9. The golf club set according to claim 8, wherein the golf club set satisfies both the following (e) and (f):

(e) the toe angle difference is increased as the loft angle is increased;

(f) the heel angle difference is increased as the loft angle is increased.

10. The golf club set according to claim 6, wherein the inclination angle θ

2c is increased as the loft angle is increased.

11. The golf club set according to claim 6, wherein if an inclination angle of the leading surface is defined as θ

1;

the inclination angle θ

1 at the central position is defined as θ

1c;

the inclination angle θ

1 at the toe reference position is defined as θ

1t; and

the inclination angle θ

1 at the heel reference position is defined as θ

1h,

the angle θ

1t is increased as the loft angle is increased;

the angle θ

1c is increased as the loft angle is increased; and

the angle θ

1h is increased as the loft angle is increased.