Golf club
First Claim
1. A golf club comprising a head including a sole portion, a crown portion, a heel portion, a toe portion, a face portion and a back portion, a shaft and a grip,the ratio of the width from the heel portion to the toe portion, the thickness of the sole portion to the crown portion and the depth from the face portion to the back portion being substantially 2:
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1.6;
said head having a substantially rectangular shape; and
a roughened surface portion having a predetermined width and a surface roughness and being capable of reducing the value of air resistance by forming a turbulent boundary layer around said head when said golf club is swung and being is annularly formed on a peripheral portion of said face portion of said head, wherein the width of said annular roughened surface portion on said peripheral portion of said face portion of said head is between 10 mm and 30 mm with the remainder of said head being substantially void of any surface roughness.
1 Assignment
0 Petitions
Accused Products
Abstract
A golf club is composed of a head, a shaft, a grip and the like, and includes a roughened surface portion capable of reducing the value of air resistance by forming a turbulent boundary layer around the head when a golfer swings. The golf club, the roughened surface portion is annularly formed in a peripheral portion of the face portion of the head a neck portion and a socket portion of the head and/or at least a portion of the shaft adjacent to the head.
221 Citations
13 Claims
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1. A golf club comprising a head including a sole portion, a crown portion, a heel portion, a toe portion, a face portion and a back portion, a shaft and a grip,
the ratio of the width from the heel portion to the toe portion, the thickness of the sole portion to the crown portion and the depth from the face portion to the back portion being substantially 2: - 1;
1.6;said head having a substantially rectangular shape; and a roughened surface portion having a predetermined width and a surface roughness and being capable of reducing the value of air resistance by forming a turbulent boundary layer around said head when said golf club is swung and being is annularly formed on a peripheral portion of said face portion of said head, wherein the width of said annular roughened surface portion on said peripheral portion of said face portion of said head is between 10 mm and 30 mm with the remainder of said head being substantially void of any surface roughness. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A golf club comprising a head including a sole portion, a crown portion, a heel portion, a toe portion, a face portion and a back portion, a shaft and a grip,
the ratio of the width from the heel portion to the toe portion, the thickness of the sole to the crown portion and the depth from the face portion to the back portion being substantially 2: - 1;
1.6,said head having a substantially rectangular shape; and a roughened surface portion capable of reducing the value of air resistance by forming a turbulent boundary layer around said head when said golf club is swung and being annularly formed on a peripheral portion of said face portion of said head, wherein the surface roughness of the roughened surface portion is gradually changed from rough to fine in a direction generally extending from said peripheral portion to said back portion.
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13. A golf club comprising a head including a sole portion, a crown portion, a heel portion, a toe portion, a face portion and a back portion, a shaft and a grip,
the ratio of the width from the heel portion to the toe portion, the thickness of the sole to the crown portion and the depth from the face portion to the back portion being substantially 2: - 1;
1.6,said head having a substantially rectangular shape; and a roughened surface portion capable of reducing the value of air resistance by forming a turbulent boundary layer around said head when said golf club is swung and being annularly formed on a peripheral portion of said face portion of said head, wherein the surface roughness of the roughened surface portion is gradually changed from fine to rough in a direction generally extending from said peripheral portion to said back portion.
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Specification