Golf club head
AssigneeSRI Sports Limited
InventorMasanori Yabu
Life of this patent
Estimating the term…
Abstract
A golf club head which comprises a face, a crown, a sole, a sidewall extending from the periphery of the sole towards the crown excluding the face, and a neck to be fixed to a shaft, and the head is formed by welding together a face member for the face, a crown member for the crown and a walled sole member for forming at least the sole and the sidewall, wherein the walled sole member is made by monoblock casting, and the face member and the crown member are each made by plastic deformation processing.
Claims9
A method of manufacturing a golf club head (a) having a lateral moment of inertia of not less than 3500 g cm2 and a vertical moment of inertia of not less than 2000 g cm2, and (b) comprising (1) a face member for forming a face for hitting a golf ball, (2) a crown member for forming a crown, (3) a walled sole member for forming a sole and a sidewall extending from the periphery of the sole towards the crown excluding the face and (4) a neck member for forming a neck to be fixed to a shaft, the method comprising
- making the walled sole member and the entirety of the neck member integrally from a first titanium alloy by monoblock casting, so that the walled sole member has a maximum thickness (t2) of at most 3.5 mm and a minimum thickness (t1), and the ratio (t2/t1) of the maximum thickness (t2) to the minimum thickness (t1) is in a range of from 1.5 to 2.5, wherein the monoblock casting is a lost-wax process,
- making the face member of a different metal material than the walled sole member by plastic deformation processing, wherein the plastic deformation processing is a press forming of a rolled sheet of the metal material,
- making the crown member having a thickness not more than 1.2 mm and thinner than the face member by press forming of a rolled sheet of a second titanium alloy whose tensile strength is higher than that of the first titanium alloy, and
- welding the face member, crown member and walled sole member together.
A method of manufacturing a golf club head having a lateral moment of inertia of not less than 3500 g cm2 and a vertical moment of inertia of not less than 2000 g cm2, and comprising (1) a face member for forming a face for hitting a golf ball, (2) a crown member for forming a crown, (3) a walled sole member for forming a sole and a sidewall extending from the periphery of the sole towards the crown excluding the face and (4) a neck member for forming a neck to be fixed to a shaft, the method comprising
- making the walled sole member and the entirety of the neck member integrally from a first titanium alloy by monoblock casting, so that the walled sole member has a maximum thickness (t2) of at most 3.5 mm and a minimum thickness (t1), and the ratio (t2/t1) of the maximum thickness (t2) to the minimum thickness (t1) is in a range of from 1.5 to 2.5, wherein the monoblock casting is a lost-wax process,
- making the face member of a different metal material than the walled sole member by plastic deformation processing,
- making the crown member having a thickness not more than 1.2 mm and thinner than the face member from a second titanium alloy whose tensile strength is higher than that of the first titanium alloy, and
- welding the face member, crown member and walled sole member together, wherein
- the face member is made by forging said different metal material, and
- the crown member is made by press forming of a rolled sheet of said second titanium alloy.
Dependencies are inferred from the claim text.