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US 8,801,542 B2Granted
Golf club
AssigneeSRI Sports Limited
InventorYasushi Sugimoto
Life of this patent
Estimating the term…
Abstract
A golf club comprises a club shaft and a golf club head attached to the tip end of the club shaft, wherein the length of the golf club is from 45 to 47 inches, the volume V of the golf club head is from 440 to 470 cu·cm, the moment of inertia M of the golf club head around the center line of the club shaft is 5500 to 6500 g sq·cm, and the ratio M/V of the moment of inertia M (g sq·cm) to the volume V (cu·cm) is from 11.0 to 13.5.
Claims11
A golf club comprising a club shaft and a golf club head attached to the tip end of the club shaft, wherein
- the length of the golf club is from 45 to 47 inches,
- the volume V of the golf club head is from 440 to 470 cu·cm,
- the moment of inertia M of the golf club head around the center line of the club shaft is 5500 to 6500 g sq·cm, and
- the ratio M/V of the moment of inertia M (g sq·cm) to the volume V (cu·cm) is from 11.0 to 13.5, and
- said golf club head comprises
- a face portion having a club face for hitting a ball,
- a crown portion defining the top surface of the golf club head,
- a sole portion defining the bottom surface of the golf club head, and
- a side portion between the crown portion and sole portion, extending from a toe-side edge of the club face to a heel-side edge of the club face through a back face of the golf club head, and provided with a toe-side opening,
- which portions are made of a material having a specific gravity ρ2,
- and wherein said side portion is provided with a toe-side opening and a side toe member closing said toe-side opening and forming a toe-side part of the side portion, said side toe member being made of a material having a specific gravity ρ1 which is less than 1.0 times but not less than 0.23 times the specific gravity ρ2.
8 more elements
A golf club comprising a club shaft and a golf club head attached to the tip end of the club shaft, wherein
- the length of the golf club is from 45 to 47 inches,
- the volume V of the golf club head is from 440 to 470 cu·cm,
- the moment of inertia M of the golf club head around the center line of the club shaft is 5500 to 6500 g sq·cm,
- the ratio M/V of the moment of inertia M (g sq·cm) to the volume V (cu·cm) is from 11.0 to 13.5, and
- said golf club head comprises
- a face portion having a club face for hitting a ball,
- a crown portion defining the top surface of the golf club head,
- a sole portion defining the bottom surface of the golf club head, and
- a side portion between the crown portion and sole portion, which extends from a toe-side edge of the club face to a heel-side edge of the club face through a back face of the golf club head, the side portion being formed by
- a side toe member forming a toe-side part of the side portion, and
- a main member forming the rest of the side portion excepting said toe-side part, wherein
- the main member is made of a material having a specific gravity ρ2, and
- the side toe member is made of a material having a specific gravity ρ1 which is less than 1.0 times but not less than 0.23 times the specific gravity ρ2,
- the crown portion is formed by, and
- a crown toe member forming a toe-side part of the crown portion, and
- a crown main member forming the rest of the crown portion excepting said toe-side part,
- wherein
- the crown toe member has a specific gravity less than that of the crown main member, and
- the crown toe member and the side toe member are separated.
16 more elements
A golf club comprising a club shaft and a golf club head attached to the tip end of the club shaft, wherein
- the length of the golf club is from 45 to 47 inches,
- the volume V of the golf club head is from 440 to 470 cu·cm,
- the moment of inertia M of the golf club head around the center line of the club shaft is 5500 to 6500 g sq·cm,
- the ratio M/V of the moment of inertia M (g sq·cm) to the volume V (cu·cm) is from 11.0 to 13.5, and
- said golf club head comprises
- a face portion having a club face for hitting a ball,
- a crown portion defining the top surface of the golf club head,
- a sole portion defining the bottom surface of the golf club head, and
- a side portion between the crown portion and sole portion, which extends from a toe-side edge of the club face to a heel-side edge of the club face through a back face of the golf club head, the side portion being formed by
- a side toe member forming a toe-side part of the side portion, and
- a main member forming a major part of the side portion excepting the toe-side part,
- wherein
- the main member is made of a material having a specific gravity ρ2, and
- the side toe member is made of a material having a specific gravity ρ1 which is less than 1.0 times but not less than 0.23 times the specific gravity ρ2, and
- wherein
- the crown portion is formed by
- a crown toe member forming a toe-side part of the crown portion, and
- a crown main member forming a major part of the crown portion excepting the toe-side part,
- wherein
- the crown toe member has a specific gravity less than that of the crown main member, and
- the crown toe member and the side toe member are united into one body.
18 more elements
Dependencies are inferred from the claim text.