Golf club head

• US 20040157678A1
• Filed: 12/03/2003
• Published: 08/12/2004
• Est. Priority Date: 12/19/2002
• Status: Active Grant

• Current Assignee: SRI Sports Limited (Sumitomo Rubber Industries Limited)
• Original Assignee: SRI Sports Limited (Sumitomo Rubber Industries Limited)
• Inventors: Kohno, Masaru
• Granted Patent: US 7,137,905 B2
• Time in Patent Office: Days
• US Class Current: 473/314
• CPC Class Codes: A63B 2053/0491 with added weights, e.g. changeable, replaceable
• CPC Class Codes: A63B 53/0408 characterised by specific dimensions, e.g. thickness
• CPC Class Codes: A63B 53/0412 Volume
• CPC Class Codes: A63B 53/0433 with special sole configurations
• CPC Class Codes: A63B 53/0437 with special crown configurations
• CPC Class Codes: A63B 53/045 Strengthening ribs
• CPC Class Codes: A63B 53/0466 wood-type
• CPC Class Codes: A63B 60/02 Ballast means for adjusting the centre of mass A63B60/24, A63B60/54 take precedence
• CPC Class Codes: A63B 60/52 with slits

Abstract

The present invention provides a golf club head which satisfies the following three conditions in a moment M of inertia around a center line of a shaft axis (g·cm²) and a depth L of center of gravity (mm):

4000≦M≦7000;  (1)

30≦L≦50; and  (2)

M≦200×L−2000.  (3)

Claims

1. A golf club head satisfying the following three conditions in a moment M of inertia around a center line of a shaft axis (g·

cm²) and a depth L of center of gravity (mm);

4000≦

M≦

7000;

 

 

(1)30≦

L≦

50; and

 

 

(2)M≦

200×

L−

2000. 

 

(3)

2. The golf club head according to claim 1, further satisfying the following two conditions:

M≦

200×

L−

2390; and

 

 

(4)M≧

200×

L−

4500. 

 

(5)

3. The golf club head according to claim 1, further satisfying the following condition:

4420≦

M≦

6500. 

 

(6)

4. The golf club head according to claim 1, further satisfying the following condition:

4600≦

M≦

6000. 

 

(7)

5. The golf club head according to claim 1, further satisfying the following condition:

34≦

L≦

45. 

 

(8)

6. The golf club head according to claim 1, further satisfying the following condition:

37≦

L≦

42. 

 

(9)

7. The golf club head according to claim 1, further satisfying the following two conditions:

M≦

200×

L−

2050; and

 

 

(10)M≧

200×

L−

5000. 

 

(11)

8. The golf club head according to claim 1, further satisfying the following two conditions:

M≦

200×

L−

3450; and

 

 

(12)M≧

200×

L−

4500. 

 

(13)

9. The golf club head according to claim 1, comprising:

a face portion forming a hitting face hitting a ball;

a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head;

a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head;

a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and

a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, wherein

in a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β

determined in accordance with the head, and a face angle is set to zero,

a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane, and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, and

in the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a weight member having a great specific gravity is firmly attached to the sole portion in an area where a center of gravity of the weight member is set to 0.2 to 0.7 times of the xm value in the X-coordinate and set to 0.1 to 0.5 times of the ym value in the Y-coordinate.

10. The golf club head according to claim 1, comprising:

a face portion forming a hitting face hitting a ball;

a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head;

a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head;

a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and

a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, wherein

in a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β

determined in accordance with the head, and a face angle is set to zero,

a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane, and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, and

in the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a thick portion having a greater thickness than the other portions is provided in the sole portion corresponding to an area where the X-coordinate is 0.2 to 0.7 times of the xm value and the Y-coordinate is 0.1 to 0.5 times of the ym value.

11. The golf club head according to claim 1, comprising:

a face portion forming a hitting face hitting a ball;

a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head;

a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head;

a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and

a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, wherein

in a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β

determined in accordance with the head, and a face angle is set to zero,

a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, and

in the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a thin portion having a smaller thickness than the other portions is provided in the sole portion corresponding to an area where the X-coordinate is equal to or less than 0.6 times of the xm value and the Y-coordinate is equal to or more than 0.4 times of the ym value.

12. The golf club head according to claim 1, comprising:

a face portion forming a hitting face hitting a ball;

a crown portion extending from an upper edge of the hitting face and forming an upper surface of the head;

a sole portion extending from a lower edge of the hitting face and forming a bottom surface of the head;

a side portion extending between the crown portion and the sole portion from a toe side edge of the hitting face to a heel side edge of the hitting face through a back face; and

a neck portion formed with a shaft insertion hole to which one end of a shaft is attached, wherein

in a measuring state where an axial center line of the shaft insertion hole is arranged in a vertical plane and is inclined at a lie angle β

determined in accordance with the head, and a face angle is set to zero,

a point at which the axial center line of the shaft insertion hole crosses a virtual plane passing through an upper end surface of the neck portion is set to an origin O, and a two-dimensional X-Y coordinate in which a Y-axis is a nodal line between the horizontal plane and the vertical plane and an X-axis is an axis line passing through the origin O and being perpendicular to the Y-axis is virtually set on the horizontal plane passing through the origin O, and

in the case where the maximum value of the Y-axis in a profile line of the head projected on the X-Y coordinate system is set to ym and the maximum value of the X-axis is set to xm, a wavy portion having an increased surface area by an alternative connection between concave portions and convex portions is provided in the sole portion corresponding to an area where the X-coordinate is 0.2 to 0.7 times of the xm value and the Y-coordinate is 0.1 to 0.5 times of the ym value.