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US 8,075,420 B2Granted
Hardened golf club head
AssigneeAcushnet Company
InventorHelene Rick
Life of this patent
Estimating the term…
Abstract
A golf club head with a hardened striking face portion that improves durability and performance is disclosed. More specifically, the golf club head disclosed may have a martensitic striking face portion that may be at least about 1.3 times harder than the rear portion of the golf club head due to the martensitic crystalline structure of the striking face portion formed by heating and quenching the striking face portion of the golf club head.
Claims24
A golf club head comprising:
- a body portion;
- and
- a hosel extending from said body wherein a relationship between said body portion and said hosel defines a loft angle;
- wherein said loft angle is greater than about 45 degrees;
- wherein said body portion comprises a striking face portion and a rear portion;
- wherein said striking face portion has a thickness of less than about 2.0 mm;
- wherein said striking face portion is comprised of a material having a martensitic crystalline structure;
- wherein said golf club head has a striking face hardness ratio of greater than about 1.3;
- and
- wherein said striking face hardness ratio is defined by a hardness of said striking face portion divided by a hardness of said rear portion.
7 more elements
A method of hardening a striking face portion of a golf club head comprising:
- heating said striking face portion of said golf club head to a target temperature for a target duration;
- and
- rapidly quenching said striking face portion in a coolant;
- wherein said golf club head has a loft angle greater than about 45 degrees;
- wherein said striking face portion transforms into a material having a martensitic crystalline structures;
- wherein said golf club head an improved striking surface hardness ratio of greater than about 1.3;
- and
- wherein said improved striking face hardness ratio is defined by a hardness of said striking face portion divided by a hardness of the remainder of said golf club head.
5 more elements
A golf club head comprising:
- a body portion;
- and
- a hosel extending from said body wherein a relationship between said body portion and said hosel defines a loft angle;
- wherein said loft angle is greater than about 45 degrees;
- wherein said body portion comprises a striking face portion and a rear portion;
- wherein said golf club head has an striking face hardness ratio of greater than about 1.3;
- and
- wherein said striking face hardness ratio is defined by a hardness of said striking face portion divided by a hardness of said rear portion.
5 more elements
Dependencies are inferred from the claim text.