Patent US4280700A successfully refreshed from Google Patents.
US4280700A
Expired / Lapsed
US
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Golf club and golf club set
Assignee: MOTION ANALYSIS Inc
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Filing: 1978-12-11
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Granted: 1981-07-28
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Expires: 1998-12-11
Abstract
Abstract A set of golf clubs, including both woods an irons, is disclosed in which the various clubs are constructed in their various parameters to aid the user to insure that each and every swing of the club follows the correct path and also to resist rotation of the club head and shaft during impact with the ball about a variety of pivot points on the shaft to assure that the ball will travel in a true flight pattern. The club head is weighted to locate its center of percussion near the toe of the head to reduce rotation of the head at impact about the shaft axis and the handle of the club is weighted to locate the center of percussion of the club below the club head to reduce rotation of the club about the pivot point defined by the base of the index finger of the lower hand in the grip. In addition the shafts of the clubs are stiffened above the club head so that the zone of maximum flexibility of the shaft is about 40 cm above the hosel of the club head whereby the head will be moved forwardly relative to the rest of the club at impact to impart greater force to the ball and distance to the hit. And, the club grip is enlarged to enable the player to apply a greater force to the club resisting rotation of the club shaft in the player's grip.
Inventors
- 👤 Stanley Plagenhoef
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:21
CPC Classifications
A; A63; A63B; A63B53/00; A63B60/00; A63B60/06; A63B60/22; A63B60/24; A63B53/005
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
57 words
A golf club comprising a club head and shaft, said club head being weighted to locate its center of gravity toward the toe 7 mm (±2 mm) from the club face center and the club head center of percussion between the toe and center of gravity 40-60 mm (±2 mm) from the longitudinal axis of said shaft.
Claim 2
Dependent Claim
57 words
A golf club comprising a club head and shaft, said club head being weighted to locate its center of gravity toward the toe 7 mm (±2 mm) from the club face center and the club head center of percussion between the toe and center of gravity 40-60 mm (±2 mm) from the longitudinal axis of said shaft.
Claim 3
Dependent Claim
26 words
A golf club as defined in claim 1 wherein said club is weighted to locate the center of percussion of the club below the club head.
Claim 4
Dependent Claim
29 words
A golf club as defined in claim 2 wherein said shaft has a zone of maximum flexibility located at a point at least 40 cm from the club head.
Claim 5
Dependent Claim
47 words
A golf club comprising a club head and a shaft, said club being weighted to locate the center of percussion of the club below the club head; said shaft having a zone of maximum flexibility located at a point at least 40 cm from the club head.
Claim 6
Dependent Claim
47 words
A golf club comprising a club head and a shaft, said club being weighted to locate the center of percussion of the club below the club head; said shaft having a zone of maximum flexibility located at a point at least 40 cm from the club head.
Claim 7
Dependent Claim
49 words
A golf club as defined in either of claims 2 or 4 wherein said club includes a grip and a 30 gram (+ or -10 grams) weight placed at the end of the grip to weight the club and locate the center of percussion thereof below the club head.
Claim 8
Dependent Claim
109 words
A set of golf clubs each having a shaft and a club head, each of said club heads having a club face center and being weighted to locate its center of gravity 7 mm (±2 mm) toward the toe of the club from said club face center, with the center of percussion of the club head located at the club face at least 36 mm (±2 mm) from the longitudinal axis of the shaft; said clubs each including a grip and a 30 gm (±10 gm) weight placed at the end of the grip to weight the club and locate the center of percussion thereof below the club head.
Claim 9
Dependent Claim
109 words
A set of golf clubs each having a shaft and a club head, each of said club heads having a club face center and being weighted to locate its center of gravity 7 mm (±2 mm) toward the toe of the club from said club face center, with the center of percussion of the club head located at the club face at least 36 mm (±2 mm) from the longitudinal axis of the shaft; said clubs each including a grip and a 30 gm (±10 gm) weight placed at the end of the grip to weight the club and locate the center of percussion thereof below the club head.
Claim 10
Dependent Claim
31 words
A set of golf clubs as defined in claim 6 wherein said shafts each include a handle and a 30 gram weight (±10 grams) placed at the end of the handle.
Claim 11
Dependent Claim
31 words
A set of golf clubs as defined in claim 7 wherein said club heads comprise golf woods and each of said club heads has substantially the same external size and weight.
Claim 12
Dependent Claim
20 words
A set of golf clubs as defined in claim 8 wherein each of said wood heads weighs 380 ±10 grams.
Claim 13
Dependent Claim
24 words
A set of golf clubs as defined in claim 9 wherein each of said clubs has a finished shaft length of approximately 43 inches.
Claim 14
Dependent Claim
90 words
A set of golf clubs as defined in claim 8 wherein said shafts each have a zone of maximum stiffness over the 20 cm thereof directly above the head and a zone of maximum flexibility having a length of approximately 12 cm and commencing at a point located between 40 and 64 cm from the head such that the total deflection of the club head from the axis of the shaft when subjected to a 10 pound force will be between 17 and 20 cm for each of the woods.
Claim 15
Dependent Claim
43 words
A set of golf clubs as defined in claim 6 wherein said club heads comprise golf irons with the center of percussion thereof located at the club face approximately 60 mm (±2 mm) from the axis passing through the center of the shaft.
Claim 16
Dependent Claim
75 words
A set of golf clubs as defined in claim 12 wherein said set includes 2, 3, 4, 5, 6, 7, 8, 9, and 10 irons with said irons defining three groups of irons respectively consisting of Set I, including the 2, 3 and 4 irons; Set II including the 5, 6 and 7 irons; and Set III including the 8, 9 and 10 irons; with the irons in each set having the same shaft length.
Claim 17
Dependent Claim
31 words
A set of golf clubs as defined in claim 13 wherein the club heads in each set have the identical external measurements, except for club face slope, and the same weight.
Claim 18
Dependent Claim
41 words
A set of golf clubs as defined in claim 13 wherein the irons in Set I weigh 451 grams ±7 grams; the irons in Set II weigh 435 grams ±7 grams; the irons in Set III weigh 450 gram ±7 grams.
Claim 19
Dependent Claim
27 words
A set of golf clubs as defined in claim 13 wherein said shafts each include a handle and a weight placed in the end of the handles.
Claim 20
Dependent Claim
38 words
A set of golf clubs as defined in claim 16 wherein the weights added to said handles are as follows: Set I: 27 grams ±4 grams Set II: 23 grams ±5 grams Set III: 20 grams ±4 grams.
Claim 21
Dependent Claim
31 words
A set of golf clubs as defined in claim 13 wherein said irons have shaft lengths selected as follows: Set I: 391/2 inches Set II: 371/2 inches Set III: 351/2 inches.
Claim 22
Dependent Claim
118 words
A set of golf clubs as defined in claim 13 wherein said shafts in each set have a zone of maximum stiffness having a length directly above the head as follows: Set I: 11 cm Set II: 10 cm Set III: 9 cm; and a zone of maximum flexibility located above the shaft head as follows: Set I: 40 to 50 cm Set II: 38 to 48 cm Set III: 36 to 46 cm such that the total deflection of the club head from the axis of the shaft when subjected to a 10 pound force will be as follows: Set I: 14 to 13.5 cm Set II: 12.5 to 12 cm Set III: 10 to 9.5 cm.
Claim 23
Dependent Claim
51 words
A set of golf clubs as defined in claim 13 wherein the balance points of the irons is located from the end of the club handle at distances as follows: Set I: 74% of the shaft length Set II: 76% of the shaft length Set III: 78% of the shaft length.
Claim 24
Dependent Claim
42 words
A set of golf clubs as defined in claim 13 wherein each iron has a flat bottom and a transverse width at the midpoint of the club head as follows: Set I: 1/2 inch Set II: 5/16 inch. Set III: 3/4 inch.
Claim 25
Dependent Claim
153 words
A set of golf clubs including woods and irons each of which includes a shaft and club head, the heads of said woods each being of substantially the same size, weight and external measurements, except for club face slope, and having a club face center and center of gravity located 7 mm toward the toe of the club from said club face center with the center of percussion thereof located at the club face 40 mm (±2 mm) from the axis of the shaft, said club heads of said irons each having substantially the same size and external measurements, except for club face slope and having a club face center and center of gravity located 7 mm toward the toe of the club from the club face center, with the center of percussion thereof located at the club face 60 mm (±2 mm) from the axis passing through the center of the shaft.
Claim 26
Dependent Claim
153 words
A set of golf clubs including woods and irons each of which includes a shaft and club head, the heads of said woods each being of substantially the same size, weight and external measurements, except for club face slope, and having a club face center and center of gravity located 7 mm toward the toe of the club from said club face center with the center of percussion thereof located at the club face 40 mm (±2 mm) from the axis of the shaft, said club heads of said irons each having substantially the same size and external measurements, except for club face slope and having a club face center and center of gravity located 7 mm toward the toe of the club from the club face center, with the center of percussion thereof located at the club face 60 mm (±2 mm) from the axis passing through the center of the shaft.
Claim 27
Dependent Claim
78 words
A set of golf clubs as defined in claim 22 wherein the wood shafts each include a handle and a 30 gram weight placed in the end of the handle and the iron shaft also includes a handle and a weight placed in the end of the handles with the weights added to the iron handles being selected as follows: Set I: 27 grams ±7 grams Set II: 23 grams ±5 grams Set III: 20 grams ±4 grams.
Claim 28
Dependent Claim
83 words
A set of golf clubs as defined in claim 22 wherein said woods are weighted such that the balance point of the clubs is located from the end of the club handle a distance equal to approximately 70% of the shaft length and the balance points of the irons is located from the end of the club handle at distances as follows: Set I: 74% of the shaft length Set II: 76% of the shaft length Set III: 78% of the shat length.
Claim 29
Dependent Claim
42 words
A set of golf clubs as defined in claim 22 wherein each iron has a flat bottom and a transverse width at the midpoint of the club head as follows: Set I: 1/2 inch Set II: 5/16 inch Set III: 3/4 inch.
References Cited (Backward Citations)
GB250815A
Cited
US1594801A
Cited
US1696462A
Cited
US1917774A
Cited
US2231847A
Cited
US2457177A
Cited
US3075768A
Cited
US3871649A
Cited
US3606327A
Cited
US4058312A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-07-27 | 1985-01-26 | 1985-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-07-27 | 1989-01-26 | 1989-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-07-27 | 1993-01-26 | 1993-07-28 | $7700.00 | Window Closed / Lapsed |