US2002142855A1PendingUtilityA1
Matched set of golf clubs and method of producing the same
Priority: Mar 31, 2000Filed: Dec 11, 2001Published: Oct 3, 2002
Est. expiryMar 31, 2020(expired)· nominal 20-yr term from priority
A63B 53/005A63B 53/10A63B 60/10A63B 60/06A63B 60/08A63B 60/00
38
PatentIndex Score
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Claims
Abstract
The present invention provides a matched set of golf clubs, wherein each club in a set of golf clubs, irons, woods, or a combination thereof, provides the golfer with precisely the same feel, related to the golfer's swing when the club is swung, and to the contact between the head of the club and golf ball when the ball is hit. In the present invention the clubs are matched dynamically. The clubs with one or all of the following characteristics: (1) a constant flexural rigidity of each complete iron and/or each complete wood, (2) a substantially constant moment of inertia, and (3) a verifying center of gravity which is calculated by using a constant force for the shortest club in the set.
Claims
exact text as granted — not AI-modifiedWe claim:
1 . A correlated set of golf clubs for use by a golfer, said correlated set of golf clubs comprising:
at least two golf clubs of an equivalent set; each club includes a shaft having a first end and a butt end; a head being located at said first end and a grip being located at said butt end;
said head having a head weight;
said plurality of shafts lengths decreases as said head weights increases;
each club has a measured frequency when said head and said grips are attached thereto; said measured frequency of said plurality of clubs being within plus or minus 1 cycle per minute of each other; and wherein said measured frequency is established by butt-cutting said butt-end of said shaft, said butt-cutting is continued until measured frequency equals the established required frequency for the length of each club in the set being built.
2 . A correlated set of golf clubs as in claim 1 , wherein each club has a swing weight which produces an optimum hit, said swing weight represents a moment of inertia (MI), each of said shafts includes said head weight (M h ), each of said clubs includes a playing length (L), each of said shafts includes a weight (M s ), each butt end includes a weight(M b ), and said head weight (M h ) being represented by:
M
h
=
MI
-
1
12
(
M
s
)
(
L
s
)
2
-
1
3
(
M
s
)
(
L
s
+
d
2
2
)
2
-
M
b
(
d
1
+
d
2
)
2
(
L
+
d
2
)
2
;
for d 1 being a distance from a center of said butt weight to said butt end of said grip and d 2 being a point above said butt end of club used as the axis of rotation.
3 . A correlated set of golf clubs as in claim 2 wherein d 1 and d 2 are equal to 2 inches.
4 . A correlated set of golf clubs as in claim 1 wherein said shafts are stepped with either parallel or tapered tips.
5 . A correlated set of golf clubs as in claim 1 wherein tip ends of said shafts are either parallel or taper tip in formation and said shafts are free from step formation.
6 . A correlated set of golf clubs as in claim 1 , wherein said club has a moment of inertia and said moment of inertia is substantially constant for each club and is related to the club head speed generated by the golfer.
7 . A correlated set of golf clubs as in claim 1 wherein said set of golf clubs includes a base club, said base club is a completed club and includes a first length, said first length is the shortest length in said set of golf clubs, a force (F) is calculated for said base club using the following equation:
F
=
WL
1
C
;
wherein:
C is a measured distance from the center of gravity of said base club to said butt end of said club;
W is a total weight of said head and said shaft of said base club;
L 1 is said first length plus d 2 for d 2 being a point above said butt end of said grip of said base club used as the axis of rotation;
a center of gravity is calculated for each additional club of said set using the following equation:
C n = W n L n F ;
wherein
C n is a calculated measurement establishing a distance from said butt end of club n of said set to said center of gravity of club n;
W n is a total weight of said head and said shaft of said club n;
L n is a length of said club n plus d 2 for d 2 being a point above said butt end of said grip of said club n used as the axis of rotation; and
F is the calculated force applied by the golfer.
8 . A method of matching a correlated set of golf clubs to a particular golfer, wherein each club has a same feel for said particular golfer, each golf club in the set has a different length and includes a shaft having a butt end and a head end, and said head end has a head, said method comprising:
(a) finding a club of the best performance and which a particular golfer determines as a club which feels the best from a set of preset test clubs for determining a proper flexural rigidity; (b) recording a frequency from said best felt club; (c) establishing a best swing weight; (d) recording said swing weight for conversion to a moment of inertia; (e) calculating a head weight (M hn ) using said moment of inertia MI for each club by the equation: M h = MI - 1 12 ( M s ) ( L s ) 2 - 1 3 ( M s ) ( L s + d 2 2 ) 2 - M b ( d 1 + d 2 ) 2 ( L + d 2 ) 2 ; where, L n is a playing length of club n, M sn is a shaft weight of club n, M bn is a weight, including said grip added to said shaft for a butt end of club n, L sn is a length of a shaft of club n, for d 1n being a distance from a center of said butt weight to said butt end of said grip and d 2 being a point above said butt end of said club n used as the axis of rotation; (f) butt-cutting said club to obtain a required length and assembling each club by attaching a head to a first end of a shaft and measuring an assembled frequency; and (g) adjusting said assembled frequency to equal said required frequency by adjusting head weight and continuing butt-cutting of said club until said assembled frequency is equal to said recorded selected frequency.
9 . A method as in claim 10 wherein there is provided the further steps of:
(h) selecting a base club, said base club includes a first length;
(i) calculating a force (F) for said base club using the following equation:
F = WL 1 C ;
wherein:
C is a measured distance from a center of gravity of said base club to said butt end of said base club;
W is a total weight of said head and said shaft of said base club;
L 1 is said first length plus d 2 for d 2 being a point above said butt end of said grip of said base club used as the axis of rotation;
(j) calculating a center of gravity for each additional club of said set using the following equation:
C n = W n L n F ;
wherein
C n is a calculated measurement establishing a distance from said butt end of club n of said set to said center of gravity of club n;
W n is a total weight of said head and said shaft of said club n; and
L n is a length of said club n plus d 2 for d 2 being a point above said butt end of said grip of said club n used as the axis of rotation; and
F is the calculated force applied by the golfer.
10 . A method of designing a correlated set of golf clubs for use by a golfer, wherein each club has a same feel, each golf club in the set has a different length and includes a shaft having a butt end and a first end, and said first end has a head and said butt end includes a grip, said method comprising:
(a) establishing a required frequency for an assembled golf club [by butt-cutting a butt end of each club for establishing a proper club length; and]; (b) butt-cutting establishes an assembled frequency; and (c) adjusting said assembled frequency to equal said required frequency by continuing butt-cutting and adjusting the head weight of said club until said assembly frequency is equal to said recorded selected frequency.
11 . A method as in claim 10 wherein there is provided the further step of correlating each club to have substantially a constant moment of inertia.
12 . A method as in claim 10 wherein there is provided the further step of calculating a center of gravity which is inversely proportional to a constant swing force of a golfer, and said center of gravity for each club includes a constant force.
13 . A method as in claim 10 wherein there is provided the further steps of:
(d) providing a grip on said butt end and establishing a swing weight which produces an optimum hit and said swing weight represents a moment of inertia (MI);
(e) calculating a head weight (M hn ) for each club by the equation:
M h = MI - 1 12 ( M s ) ( L s ) 2 - 1 3 ( M s ) ( L s + d 2 2 ) 2 - ( M b ( d 1 + d 2 ) ) 2 ( L + d 2 ) 2 ;
where,
L n is a playing length of club n,
M sn is a shaft weight of club n,
M bn is a weight for said butt end of club n,
L sn is a length of a shaft of club n,
for d 1n being a distance from a center of said butt weight to said butt end of said grip and d 2 being a point above said butt end of club n used as the axis of rotation.
14 . A method as in claim 10 wherein there is provided the further steps of:
(d) selecting a base club, said base club includes a first length;
(e) calculating a force (F) for said base club using the following equation:
F = WL 1 C ;
wherein:
C is a measured distance from a center of gravity of said base club to said butt end of said club;
W is a total weight of said head and said shaft of said base club;
L 1 is said first length plus d 2 for d 2 being a point above said butt end of said grip of said base club used as the axis of rotation;
(e) calculating a center of gravity for each additional club of said set using the following equation:
C n = W n L n F ;
wherein
C n is a calculated measurement establishing a distance from said butt end of club n of said set to said center of gravity of club n;
W n is a total weight of said head and said shaft of said club n; and
L n is a length of said club n plus d 2 for d 2 being a point above said butt end of said grip of said club n used as the axis of rotation; and
F is the calculated force applied by the golfer.
15 . A method as in claim 12 wherein said shafts are stepped with either parallel or tapered tips.
16 . A method as in claim 12 wherein tip ends of said shafts are either parallel or taper tip in formation and said shafts are not stepped.
17 . A method of matching a correlated set of golf clubs as in claim 1 wherein said shafts are fabricated from wood, steel, graphite, or any material used for fabricating conventional golf clubs.Cited by (0)
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