Iron-type golf club head
View Patent ↗An iron-type golf club head comprises an upper heel-side region having a specific gravity ρ1, a lower heel-side region having a specific gravity ρ2, an upper middle region having a specific gravity ρ3, a lower middle region having a specific gravity ρ4, an upper toe-side region having a specific gravity ρ5 and a lower toe-side region having a specific gravity ρ6 which satisfy the following conditions: ρ1<ρ2, ρ3<ρ4, ρ5<ρ6, ρ4<ρ2, ρ4<ρ6, ρ3<ρ1, and ρ3<ρ5. These six regions are sectioned by a horizontal plane, a toe-side vertical plane and a heel-side vertical plane.
1. An iron-type golf club head comprising
an upper heel-side region having an average specific gravity ρ1,
a lower heel-side region having an average specific gravity ρ2,
an upper middle region having an average specific gravity ρ3,
a lower middle region having an average specific gravity ρ4,
an upper toe-side region having an average specific gravity ρ5 and
a lower toe-side region having an average specific gravity ρ6 which satisfy the following conditions (1) to (7):
ρ1<ρ2 (1)
ρ3<ρ4 (2)
ρ5<ρ6 (3)
ρ4<ρ2 (4)
ρ4<ρ6 (5)
ρ3<ρ1 (6)
ρ3<ρ5 (7)
and which regions are sectioned by an upper horizontal plane, a toe-side vertical plane and a heel-side vertical plane,
wherein
in a standard state of the club head set on a horizontal plane at a lie angle and a loft angle specified for the club head, the upper horizontal plane is positioned 17 mm above the horizontal plane,
the toe-side vertical plane extends parallel with a front-back direction of the club head at a position 15 mm toward the toe from a club face center, and
the heel-side vertical plane extends parallel with a front-back direction of the club head at a position 15 mm toward the heel from the club face center.
2. The iron-type golf club head according to claim 1 , wherein
the lower heel-side region having the average specific gravity ρ2 and the lower toe-side region having the average specific gravity ρ6 satisfy the following condition (8):
ρ6>ρ2 (8).
3. The iron-type golf club head according to claim 1 , wherein
a mass w1 of the upper heel-side region,
a mass w2 of the lower heel-side region,
a mass w3 of the upper middle region,
a mass w4 of the lower middle region,
a mass w5 of the upper toe-side region and
a mass w6 of the lower toe-side region
satisfy the following conditions (9) to (14):
w 3< w 4 (9)
w 5< w 6 (10)
w 4< w 2 (11)
w 4< w 6 (12)
w 3< w 1 (13)
w 3< w 5 (14).
4. The iron-type golf club head according to claim 2 , wherein
a mass w1 of the upper heel-side region,
a mass w2 of the lower heel-side region,
a mass w3 of the upper middle region,
a mass w4 of the lower middle region,
a mass w5 of the upper toe-side region and
a mass w6 of the lower toe-side region
satisfy the following conditions (9) to (14):
w 3< w 4 (9)
w 5< w 6 (10)
w 4< w 2 (11)
w 4< w 6 (12)
w 3< w 1 (13)
w 3< w 5 (14).
5. The iron-type golf club head according to claim 3 , wherein
the mass w1 of the upper heel-side region and the mass w2 of the lower heel-side region satisfy the following condition (15):
w 1 −w 2<1 gram (15).
6. The iron-type golf club head according to claim 1 , which comprises a head main body and a weight member fixed to the head main body, wherein
the head main body is provided in a sole with a groove-like depression extending in a toe-heel direction,
the weight member is mounted in the groove-like depression, and
the weight member includes
a toe-side weight member mounted in a toe-side part of the groove-like depression,
a heel-side weight member mounted in a heel-side part of the groove-like depression, and
a sole cover weight member fitted to the groove-like depression so as to cover the toe-side weight member and the heel-side weight member.
7. The iron-type golf club head according to claim 6 , wherein
the sole cover weight member has a specific gravity more than a specific gravity of the head main body, and
each of the toe-side weight member and the heel-side weight member has a specific gravity more than the specific gravity of the sole cover weight member.
8. The iron-type golf club head according to claim 6 , wherein
the specific gravity of the toe-side weight member is more than the specific gravity of the heel-side weight member.
9. The iron-type golf club head according to claim 6 , wherein
the sole cover weight member is welded to the head main body, and
the toe-side weight member and the heel-side weight member are secured therebetween without being welded to the head main body.
10. The iron-type golf club head according to claim 6 , wherein
the sole cover weight member is composed of a toe-side thin-walled portion located below the toe-side weight member,
a heel-side thin-walled portion located below the heel-side weight member, and
a central thick-walled portion located therebetween.
11. The iron-type golf club head according to claim 7 , wherein
the sole cover weight member is composed of a toe-side thin-walled portion located below the toe-side weight member,
a heel-side thin-walled portion located below the heel-side weight member, and
a central thick-walled portion located therebetween.
12. The iron-type golf club head according to claim 8 , wherein
the sole cover weight member is composed of a toe-side thin-walled portion located below the toe-side weight member,
a heel-side thin-walled portion located below the heel-side weight member, and
a central thick-walled portion located therebetween.