Golf club head, iron golf club head, wood golf club head, and golf club set
First Claim
1. A golf club set comprising a plurality of golf clubs having different identification numbers, whereineach of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head;
- each of sail golf club heads has an ellipsoid of inertia with its center at a center of gravity;
when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of θ
with an intersecting line of said cut surface and a ground surface;
the major axis of said plane ellipse extends upward and away from the ground surface as it approaches a toe part;
said angle θ
is not smaller than 0.5° and
not larger than 9.5°
;
an aspect ratio a/b defined by a ratio α
length α
of the major axis to length b of a minor axis of said plane ellipse is not smaller than 1 and not larger than 4;
said angle θ
of each of the plurality of golf club heads increases successively with an approximately constant ratio according as the identification number of said golf club increases; and
said aspect ratio a/b of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases.
1 Assignment
0 Petitions
Accused Products
Abstract
A golf club head (11) has an ellipsoid of inertia (12) with its center at a center of gravity G. When the ellipsoid of inertia (12) is virtually cut with a plane passing through the center of gravity of the golf club head (11) and being parallel to a face surface (11f), a major axis of a plane ellipse (13) appearing on its cut surface forms an angle of θ with an intersecting line (15) of the cut surface and a ground surface (16). The major axis extends upward and away from the ground surface (16) as it approaches a toe part (11t). The angle θ is not smaller than 0.5° and not larger than 9.5°. An aspect ratio a/b defined by a ratio of the length a of the major axis (13d) to the length b of a minor axis (13e) of the plane ellipse (13) is not smaller than 1 and not larger than 4.
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Citations
33 Claims
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1. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head; -
each of sail golf club heads has an ellipsoid of inertia with its center at a center of gravity;
when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of θ
with an intersecting line of said cut surface and a ground surface;
the major axis of said plane ellipse extends upward and away from the ground surface as it approaches a toe part;
said angle θ
is not smaller than 0.5° and
not larger than 9.5°
;
an aspect ratio a/b defined by a ratio α
length α
of the major axis to length b of a minor axis of said plane ellipse is not smaller than 1 and not larger than 4;
said angle θ
of each of the plurality of golf club heads increases successively with an approximately constant ratio according as the identification number of said golf club increases; and
said aspect ratio a/b of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases. - View Dependent Claims (2)
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3. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head; -
each of said golf club heads has an ellipsoid of inertia with its center at a center of gravity;
when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface for ms an angle of θ
with an intersecting line of said cut surface and a ground surface;
said major axis extends upward and away from the ground surface as it approaches a toe part;
said angle θ
is not smaller than 0.5° and
not larger than 9.5°
;
said angle θ
of each of the plurality of golf club heads increases successively with an approximately constant ratio according as the identification number of said golf club increases; and
a height h of a sweet spot of each of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases. - View Dependent Claims (4)
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5. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head; -
each of said golf club heads has an ellipsoid of inertia with its center at a center of gravity;
when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, an aspect ratio a/b defined by a ratio of a length a of the major axis to a length b of a minor axis of a plane ellipse appearing on its cut surface is not smaller than 1 and not larger than 4;
a height h of a sweet spot from a ground surface is not smaller than 10 mm and not larger than 30 mm;
said aspect ratio a/b of each of said plurality of golf club heads decreases successively with an approximately constant ratio according as the identification number of said golf club increases; and
the height h of the sweet spot of each of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases. - View Dependent Claims (6)
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7. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head and a shaft connected to said golf club head; -
each of said golf club heads has an ellipsoid of inertia with its center at a center of gravity;
when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, an aspect ratio a/b defined by ratio of a length a of the major axis to a length b of a minor axis of a plane ellipse appearing on its cut surface is not smaller than 1 and not larger than 4;
a height h of a sweet spot from a ground surface is not smaller than 10 mm and not larger than 30 mm;
said aspect ratio a/b of each of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases;
the height h of the sweet spot of each of said plurality of golf club heads decreases successively or remains approximately equal according as said identification number increases;
said major axis forms an angle of θ
with an intersecting line of said cut surface and a ground surface;
said major axis extends upward and away from the ground surface as it approaches a toe part;
said angle θ
is not smaller than 0.5° and
not larger than 9.5°
; and
said angle θ
of each of said plurality of golf club heads increases successively with an approximately constant ratio according as the identification number of said golf club increases.
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8. A golf club set comprising a plurality of iron golf clubs having different identification numbers wherein,
each iron golf club has a head body having a toe, a sole, and a heel; -
wherein each iron golf club has a first weight member disposed in an upper part of the toe of said head body; and
wherein each iron golf club has a second weight member disposed in a heel side part of the sole of said head body, wherein each of the iron golf club heads have an ellipsoid of inertia with its center at a center of gravity, wherein when said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said head body and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of θ
with an intersecting line of said cut surface and a ground surface, andwherein said angle θ
increases successively with an approximately constant ratio according as the identification number of said golf club increases.- View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16)
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17. A golf club set comprising a plurality of golf clubs having an identification number a club head, and an ellipsoid of inertia with its center at a center of gravity, wherein
when said ellipsoid of inertia of each of said plurality of golf clubs is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of θ - with an intersecting line of said cut surface and a ground surface;
the major axis of said plane ellipse extends upward and away from the ground surface as it approaches a toe panrt; and
an aspect ratio a/b defined by a ratio of a length a of the major axis to a length b of a minor axis of said plane ellipse decreases successively with an approximately constant ratio according as said identification number of said golf club increases. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25)
a head body having a toe, a sole, and a heel;
a first weight member disposed in an upper part of the toe of said head body; and
a second weight member disposed in a heel side part of the sole of said head body.
- with an intersecting line of said cut surface and a ground surface;
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23. The golf club set as set forth in claim 22, wherein said first weight member has a larger specific gravity than a material constituting said head body.
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24. The golf club set as set forth in claim 22, wherein said second weight member has a larger specific gravity than a material constituting said head body.
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25. The golf club set as set forth in claim 22, wherein said first weight member has a larger density than other parts of said head body.
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26. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head; -
each of said golf club heads has an ellipsoid of inertia;
wherein said ellipsoid of inertia is virtually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, a major axis of a plane ellipse appearing on its cut surface forms an angle of θ
with an intersecting line of said cut surface and a ground surface; and
said angle θ
increases successively with an approximately constant ratio according as the identification number of said golf club increases.- View Dependent Claims (27, 28, 29)
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30. A golf club set comprising a plurality of golf clubs having different identification numbers, wherein
each of said plurality of golf clubs has a golf club head; -
each of said golf club heads has an ellipsoid of inertia;
wherein said ellipsoid of inertia is visually cut with a plane passing through the center of gravity of said golf club head and being parallel to a face surface, an aspect ratio a/b defined by a ratio of a length a of the major axis to a length b of a minor axis of a plane ellipse appearing on its cut surface; and
wherein said aspect ratio a/b decreases successively with an approximately constant ratio according as the identification number of said golf club increases. - View Dependent Claims (31, 32, 33)
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Specification