Multi-piece golf club head with improved inertia
View Patent ↗A multi-piece iron-type golf club head with a substantial weight member is disclosed and claimed. The golf club head includes a plurality of body members. A first body member includes a face, a rear surface, and a hosel. A viscoelastic material is attached to the rear surface, and a second body member is attached to the viscoelastic material. The second body member, which may be a weight member, has a substantially larger mass than in known golf clubs.
1. An iron-type golf club head, comprising:
a first body member including a face, a rear surface, and a hosel;
a viscoelastic material coupled to said rear surface; and
a second body member coupled to said viscoelastic material;
wherein said second body member is a weight member with a mass of at least 10 grams;
wherein at least a portion of said rear surface has a concave profile extending from a heel of said club head to a toe of said club head and viscoelastic material is coupled to said rear surface within said concave profile; and
wherein the club head further comprises a center of gravity and a moment of inertia measured about a vertical axis passing through said center of gravity from approximately 2400 g·cm 2 to approximately 2900 g·cm 2 .
2. The golf club head of claim 1 , wherein said weight member has a mass of 50 to 300 grams.
3. The golf club head of claim 1 , wherein said weight member has a mass of at least 100 grams.
4. The golf club head of claim 1 , wherein the club head has a weight and said weight member comprises from 4% to 75% of said club head weight.
5. The golf club head of claim 1 , wherein the club head has a weight and said weight member comprises from 25% to 50% of said club head weight.
6. The golf club head of claim 1 , wherein said second body member is coupled to said viscoelastic material within said concave profile.
7. The golf club head of claim 1 , wherein the golf club head includes a sole comprised at least in part by said second body member.
8. The golf club head of claim 1 , wherein the golf club head includes a sole comprised entirely by said first body member.
9. The golf club head of claim 1 , wherein said viscoelastic material is selected from a group of viscoelastic materials, with each of said materials having different functional characteristics.
10. The golf club head of claim 1 , wherein said moment of inertia is from approximately 2500 g·cm 2 to approximately 2700 g·cm 2 .
11. The golf club head of claim 1 , wherein said first body member, said viscoelastic material, and said second body member form a mass/spring system to reduce vibrations within the club head.
12. A set of golf clubs, comprising:
a plurality of golf club heads, wherein each head includes:
a first body member including a face, a rear surface, and a hosel;
a second body member coupled to said rear surface;
a viscoelastic material intermediate said first and second body members; and
a center of gravity and a moment of inertia measured about a vertical axis passing through said center of gravity;
wherein each of said moments of inertia are substantially the same; and
wherein a difference between a maximum and a minimum of said moments of inertia is 40 g·cm 2 or less.
13. The set of claim 12 , wherein said moments of inertia are from approximately 2400 g·cm 2 to approximately 2900 g·cm 2 .
14. The set of claim 13 , wherein said moments of inertia are from approximately 2500 g·cm 2 to approximately 2700 g·cm 2 .
15. The set of claim 12 , wherein said difference is 20 g·cm 2 or less.
16. The set of claim 12 , wherein the set includes at least three club heads.