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US 7,153,222 B2Granted
Forged iron-type golf clubs
AssigneeAcushnet Company
InventorsPeter J. Gilbert, Michael S. Burnett
Life of this patent
Estimating the term…
Abstract
Forged cavity back iron-type clubs and oversize clubs are disclosed. These forged clubs have thin, durable hitting face and relatively large cavity volumes. These clubs have high rotational moments of inertia to minimize distance and accuracy penalties associated with off-center hits. Long irons with hitting face of about 0.100 inch thick are achievable by the present invention. Also disclosed are forged irons made from stainless steels and annealed to achieve the desired hardness and ductility.
Claims34
An iron-type golf club comprising:
- a club head made from a forged metal and having a hosel, a front and a back, wherein the back comprises a cavity defined by a perimeter member and the front has a hitting zone located opposite to and coinciding with the cavity, and wherein the hitting zone has a ratio in accordance to the following equation:
- ratio≧−((1/4.5)×loft angle°)|25,
- wherein the ratio is the area of the hitting zone (inch2) divided by the minimum thickness (inch) and wherein the perimeter member is thicker on the bottom of the club head than on the top.
An iron-type golf club comprising:
- a club head made from a forged metal and having a hosel, a front and a back, wherein the back comprises a cavity defined by a perimeter member and the front has a hitting zone located opposite to and coinciding with the cavity, and wherein the hitting zone has a ratio greater than or equal to about 15, wherein the ratio is the area of the hitting zone (inch2) divided by the minimum thickness (inch).
Dependencies are inferred from the claim text.