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US 8,075,421 B2Granted
Golf club head
AssigneeSRI Sports Limited
InventorTomoya Hirano
Life of this patent
Estimating the term…
Abstract
A golf club head comprises a face portion of which front face defines a club face, wherein at least a part of the face portion is formed by a unidirectionally rolled plate of a titanium alloy having alpha phase such as alpha titanium alloys and alpha+beta titanium alloys, and the unidirectional rolled direction of the plate is oriented in the toe-heel direction of the head. At least 50% in area of the face portion is formed by the unidirectionally rolled plate. The angle (theta) between the rolled direction and the toe-heel direction is not more than 15 degrees.
Claims19
A golf club head comprising
- a face portion of which front face defines a club face,
- a crown portion,
- a sole portion,
- a side portion between the crown portion and sole portion, and
- a hosel portion,
- wherein said golf club head has a hollow shell structure with a thin wall and is composed of a main shell body provided with a front opening and a face plate covering the front opening, wherein the face plate is provided around its main portion with a turnback, and the main portion of the face plate forms the entirety of the face portion, whereby the main shell body includes a major part of the golf club head excluding the face portion and a portion corresponding to the turnback,
- wherein the face plate is made of a unidirectionally rolled plate of a titanium alloy,
- the titanium alloy is an alpha+beta titanium alloy selected from a group consisting of Ti-4.5Al-3V-2Fe-2Mo, Ti-4.5Al-2Mo-1.6V-0.5Fe-0.3Si-0.03C, Ti-1Fe-0.35O-0.01N, Ti-8Al-1Mo, Ti-5.5Al-1Fe, Ti-6Al-4V, Ti-6Al-6V-2Sn, Ti-6Al-2Sn-4Zr-6Mo, Ti-6Al-2Sn-4Zr-2Mo, and Ti-8Al-1Mo-1V, and
- the unidirectionally rolled plate is unidirectionally rolled in a unidirectional rolled direction,
- the unidirectional rolled direction of the plate is oriented in a toe-heel direction of the head so that an angle between the unidirectional rolled direction and the toe-heel direction becomes at most 15 degrees, wherein
- a tensile strength Spd of the unidirectionally rolled plate in a direction perpendicular to the unidirectional rolled direction is not less than 1.20 times, but not more than 1.60 times a tensile strength Srd of the unidirectionally rolled plate in the unidirectional rolled direction, and
- said club face has an aspect ratio of not less than 1.65 but not more than 2.10, wherein the aspect ratio is a ratio (FW/FH) of a width FW of the club face measured in the toe-heel direction along the club face passing through a sweet spot to a height FH of the club face measured in a crown-sole direction along the club face passing through the sweet spot.
9 more elements
A golf club head comprising
- a face portion of which front face defines a club face,
- a crown portion,
- a sole portion,
- a side portion between the crown portion and sole portion, and
- a hosel portion,
- wherein said golf club head has a hollow shell structure with a thin wall and is composed of a main shell body provided with a front opening and a face plate covering the front opening,
- wherein the face plate is provided around its main portion with a turnback, and the main portion of the face plate forms the entirety of the face portion, whereby the main shell body includes a major part of the golf club head excluding the face portion and a portion corresponding to the turnback,
- wherein the face plate is made of a unidirectionally rolled plate of a titanium alloy,
- the titanium alloy is an alpha+beta titanium alloy selected from a group consisting of Ti-4.5Al-3V-2Fe-2Mo, Ti-4.5Al-2Mo-1.6V-0.5Fe-0.3Si-0.03C, Ti-1Fe-0.35O-0.01N, Ti-8Al-1Mo, Ti-5.5Al-1Fe, Ti-6Al-4V, Ti-6Al-6V-2Sn, Ti-6Al-2Sn-4Zr-6Mo, Ti-6Al-2Sn-4Zr-2Mo, and Ti-8Al-1Mo-1V, and
- the unidirectionally rolled plate is unidirectionally rolled in a unidirectional rolled direction,
- the unidirectional rolled direction of the plate is oriented in a toe-heel direction of the head so that an angle between the unidirectional rolled direction and the toe-heel direction becomes at most 15 degrees, wherein
- a tensile elastic modulus Epd of the unidirectionally rolled plate in a direction perpendicular to the unidirectional rolled direction is not less than 1.10 times, but not more than 1.35 times a tensile elastic modulus Erd of the unidirectionally rolled plate in the unidirectional rolled direction, and
- said club face has an aspect ratio of not less than 1.65 but not more than 2.10, wherein the aspect ratio is a ratio (FW/FH) of a width FW of the club face measured in the toe-heel direction along the club face passing through a sweet spot to a height FH of the club face measured in a crown-sole direction along the club face passing through the sweet spot.
10 more elements
A golf club head comprising
- a face portion of which front face defines a club face,
- a crown portion,
- a sole portion,
- a side portion between the crown portion and sole portion, and
- a hosel portion,
- wherein said golf club head has a hollow shell structure with a thin wall and is composed of a main shell body provided with a front opening and a face plate covering the front opening,
- wherein the face plate is provided around its main portion with a turnback, and the main portion of the face plate forms the entirety of the face portion, whereby the main shell body includes a major part of the golf club head excluding the face portion and a portion corresponding to the turnback,
- wherein the face plate is made of a unidirectionally rolled plate of a titanium alloy,
- the titanium alloy is an alpha+beta titanium alloy selected from a group consisting of Ti-4.5Al-3V-2Fe-2Mo, Ti-4.5Al-2Mo-1.6V-0.5Fe-0.3Si-0.03C, Ti-1Fe-0.35O-0.01N, Ti-8Al-1Mo, Ti-5.5Al-1Fe, Ti-6Al-4V, Ti-6Al-6V-2Sn, Ti-6Al-2Sn-4Zr-6Mo, Ti-6Al-2Sn-4Zr-2Mo, and Ti-8Al-1Mo-1V, and
- the unidirectionally rolled plate is unidirectionally rolled in a unidirectional rolled direction,
- the unidirectional rolled direction of the plate is oriented in a toe-heel direction of the head so that an angle between the unidirectional rolled direction and the toe-heel direction becomes at most 15 degrees, wherein
- a tensile strength Spd of the unidirectionally rolled plate in a direction perpendicular to the unidirectional rolled direction is not less than 1.20 times, but not more than 1.60 times a tensile strength Srd of the unidirectionally rolled plate in the unidirectional rolled direction, and
- a tensile elastic modulus Epd of the unidirectionally rolled plate in the direction perpendicular to the unidirectional rolled direction is not less than 1.10 times, but not more than 1.35 times a tensile elastic modulus Erd of the unidirectionally rolled plate in the unidirectional rolled direction, and
- said club face has an aspect ratio of not less than 1.65 but not more than 2.10, wherein the aspect ratio is a ratio (FW/FH) of a width FW of the club face measured in the toe-heel direction along the club face passing through a sweet spot to a height FH of the club face measured in a crown-sole direction along the club face passing through the sweet spot.
11 more elements
Dependencies are inferred from the claim text.