US4203598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf club
Assignee: DFD SPORTS Inc A CORP OF NJ
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Filing: 1977-10-17
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Granted: 1980-05-20
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Expires: 1997-10-17
Abstract
Abstract An improved method of determining the true swing weight of a golf club is provided by balancing the club at a fulcrum located under the shaft at a point approximately five inches from the tip of the grip end of the shaft. All of the golf clubs in a set are matched to each other on the basis of (a) total club weight; (b) the location of the club's center of gravity at a point on the shaft which is a constant distance from the tip of the grip end of each club; (c) true swing weight. This matching is accomplished while accounting for the effects of an additional component weight placed in the grip end of the shaft, displaced radially from the shaft axis. This additional component weight also produces a countering force to the torquing forces which act to resist the golfer's efforts to bring the club face into proper alignment for impact during the latter part of the downswing. This additional component weight also tends to counter the precessional forces on the head which develop during the swinging of the club. A club design is also disclosed which results in the location of the center for percussion for the moving club at a position closer to the point of impact of the club face with the ball.
Inventors
- 👤 Alfred Stuff
- 👤 Anthony Pellizzi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:27
CPC Classifications
A; A63; A63B; A63B60/00; A63B60/06; A63B60/22; A63B60/24; A63B53/00; A63B53/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
128 words
A method of minimizing or eliminating the axial torquing forces exerted on the shaft of a moving golf club, the club being an iron or wood, which club consists of a shaft, a grip and a club head immovably affixed thereto which method comprises affixing to the club shaft an additional weight component W x at a position which is radially displaced from the longitudinal axis of the club shaft, proximate to the grip end of the shaft, and not extending beyond the surface of the grip, the center of gravity of said additional weight component lying in the plane defined by the longitudinal axis of the shaft and the center of gravity of the club, and on the same side of the shaft as the club head.
Claim 2
Independent Claim
128 words
A method of minimizing or eliminating the axial torquing forces exerted on the shaft of a moving golf club, the club being an iron or wood, which club consists of a shaft, a grip and a club head immovably affixed thereto which method comprises affixing to the club shaft an additional weight component W x at a position which is radially displaced from the longitudinal axis of the club shaft, proximate to the grip end of the shaft, and not extending beyond the surface of the grip, the center of gravity of said additional weight component lying in the plane defined by the longitudinal axis of the shaft and the center of gravity of the club, and on the same side of the shaft as the club head.
Claim 3
Dependent Claim
57 words
The method of claim 1 which further comprises determining the original swing weight of the club before the additional weight component W x is affixed to the club shaft, and increasing or decreasing the total weight of the club head to restore the original swing weight of the club after affixing the weight component W x .
Claim 4
Independent Claim
308 words
A method of minimizing or eliminating during use, the axial torquing forces exerted on the shafts of a set of golf clubs, where the set consists of a plurality of irons or woods, or both, wherein each of the clubs in the set has a shaft of different length, a grip and a club head immovably affixed thereto with each of said club heads having a unique loft angle, said set without designed incremental differences in total weight between the clubs comprising the set, all of which are balanced and matched to each other to have substantially the same (a) swing weight for all of the clubs in the set as measured about a fulcrum located between the center of gravity and the tip of the grip end of the club shaft when said fulcrum is located at the same distance from the tip of the grip end for each of the clubs in the set, (b) total weight; and (c) have their center of gravity as measured on the club shaft, at approximately the same distance from the tip of the grip end of the shaft, which method comprises affixing to the shaft of each club in the set an additional weight component W x at a position which is radially displaced from the longitudinal axis of the club shaft, proximate to the grip end of the shaft and not extending beyond the surface of the grip, the center of gravity of said additional weight component lying in the plane defined by the longitudinal axis of the shaft and the center of gravity of the club, and on the same side of the shaft as the club head, the position and weight of W x being determined for each club in the set to eliminate or minimize the axial torquing forces produced by the moving club head.
Claim 5
Independent Claim
308 words
A method of minimizing or eliminating during use, the axial torquing forces exerted on the shafts of a set of golf clubs, where the set consists of a plurality of irons or woods, or both, wherein each of the clubs in the set has a shaft of different length, a grip and a club head immovably affixed thereto with each of said club heads having a unique loft angle, said set without designed incremental differences in total weight between the clubs comprising the set, all of which are balanced and matched to each other to have substantially the same (a) swing weight for all of the clubs in the set as measured about a fulcrum located between the center of gravity and the tip of the grip end of the club shaft when said fulcrum is located at the same distance from the tip of the grip end for each of the clubs in the set, (b) total weight; and (c) have their center of gravity as measured on the club shaft, at approximately the same distance from the tip of the grip end of the shaft, which method comprises affixing to the shaft of each club in the set an additional weight component W x at a position which is radially displaced from the longitudinal axis of the club shaft, proximate to the grip end of the shaft and not extending beyond the surface of the grip, the center of gravity of said additional weight component lying in the plane defined by the longitudinal axis of the shaft and the center of gravity of the club, and on the same side of the shaft as the club head, the position and weight of W x being determined for each club in the set to eliminate or minimize the axial torquing forces produced by the moving club head.
Claim 6
Independent Claim
120 words
A method of improving the striking efficiency of a golf club which club consists of a head, a shaft and a grip, which consists of (a) determining the original swing weight of the club, (b) affixing an additional weight component W x to the club shaft at a distance which is less than about five inches from the tip of the grip end of the shaft, and (c) increasing the weight of the club head in proportion to that of the additional weight component W x to restore the original swing weight of the club, to thereby move the center of percussion of the club in the direction of the zone of impact of the club head with the ball.
Claim 7
Independent Claim
120 words
A method of improving the striking efficiency of a golf club which club consists of a head, a shaft and a grip, which consists of (a) determining the original swing weight of the club, (b) affixing an additional weight component W x to the club shaft at a distance which is less than about five inches from the tip of the grip end of the shaft, and (c) increasing the weight of the club head in proportion to that of the additional weight component W x to restore the original swing weight of the club, to thereby move the center of percussion of the club in the direction of the zone of impact of the club head with the ball.
Claim 8
Dependent Claim
177 words
A set of golf clubs consisting of a plurality of irons or woods, or both, wherein each of the clubs of the set contains an additional weight component W x independently affixed within the club shaft at a longitudinal position which is less than about five inches from the tip of the grip end of the shaft to optimize the location of the center of percussion of each club, and all of the clubs in the set are balanced and matched to each other to have substantially the same (a) swing weight for all of the clubs in the set as measured about a fulcrum located between the center of gravity and the tip of the grip end of the club shaft when said fulcrum is located at the same distance from the tip of the grip end for each of the clubs in the set, (b) total weight; and (c) have their center of gravity as measured on the club shaft, at approximately the same distance from the tip of the grip end of the shaft.
Claim 9
Dependent Claim
177 words
A set of golf clubs consisting of a plurality of irons or woods, or both, wherein each of the clubs of the set contains an additional weight component W x independently affixed within the club shaft at a longitudinal position which is less than about five inches from the tip of the grip end of the shaft to optimize the location of the center of percussion of each club, and all of the clubs in the set are balanced and matched to each other to have substantially the same (a) swing weight for all of the clubs in the set as measured about a fulcrum located between the center of gravity and the tip of the grip end of the club shaft when said fulcrum is located at the same distance from the tip of the grip end for each of the clubs in the set, (b) total weight; and (c) have their center of gravity as measured on the club shaft, at approximately the same distance from the tip of the grip end of the shaft.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-20 | 1983-11-19 | 1984-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-20 | 1987-11-19 | 1988-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-20 | 1991-11-19 | 1992-05-20 | $7700.00 | Window Closed / Lapsed |