Patent US1757515A successfully refreshed from Google Patents.
Patent US3871649A successfully refreshed from Google Patents.
US3871649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matched set of golf clubs
Assignee: Dunlop Co Ltd
•
Filing: 1969-10-02
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Granted: 1975-03-18
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Expires: 1989-10-02
Abstract
Abstract A matched set of golf clubs, of which each club comprises a shaft and a club head carried thereon, wherein the flexural rigidity of the shaft of any wood or iron of the set is not more than that of any longer wood or iron, respectively, of the set. Thus the club shafts became more flexible per unit length as they get shorter, this being opposite to conventional trends. This reversed trend has been found to be very advantageous particularly in that matched sets of clubs can be provided having matched moments of inertia and matched frequency of vibration. Thus, all the clubs of the set will have a very similar feel in use.
Inventors
- 👤 John Arthur Kilshaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:20
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/005; A63B60/00; A63B60/0081; A63B53/12; A63B60/06; A63B60/08; A63B60/10; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
117 words
A matched set of golf clubs having woods and irons, each club of said set comprising a shaft having a club head on one end and a grip on the opposite end and said set comprising a plurality of woods of decreasing shaft length and increasing loft and a plurality of irons of decreasing shaft length and increasing loft, the improvement comprising having the flexural rigidity of the shaft of any wood in the set not greater than that of the shaft of any longer wood in the set and having the flexural rigidity of the shaft of any iron in said set not greater than that of the shaft of any longer iron in said set.
Claim 2
Dependent Claim
117 words
A matched set of golf clubs having woods and irons, each club of said set comprising a shaft having a club head on one end and a grip on the opposite end and said set comprising a plurality of woods of decreasing shaft length and increasing loft and a plurality of irons of decreasing shaft length and increasing loft, the improvement comprising having the flexural rigidity of the shaft of any wood in the set not greater than that of the shaft of any longer wood in the set and having the flexural rigidity of the shaft of any iron in said set not greater than that of the shaft of any longer iron in said set.
Claim 3
Dependent Claim
43 words
A matched set of golf clubs according to claim 1, in which the values for flexural rigidity of the shafts of both the woods And the irons decrease progressively from the longest to the shortest shaft of the woods and of the irons.
Claim 4
Dependent Claim
45 words
A matched set of golf clubs according to claim 2, in which the shafts are of stepped metal tube and the decrease in flexural rigity from one shaft to another is obtained by use of different wall thicknesses for the various steps of each shaft.
Claim 5
Dependent Claim
50 words
A matched set of golf clubs according to claim 2, in which the shafts are of stepped metal tube and the decrease in flexural rigidity from one shaft to another is obtained by an increase in the length of the step most distant from the grip end of the clubs.
Claim 6
Dependent Claim
36 words
A matched set of golf clubs according to claim 4, in which the length of the various steps between the two terminal steps of the tube is the same for all the irons of the set.
Claim 7
Dependent Claim
36 words
A matched set of golf clubs according to claim 4, in which the length of the various steps between the two terminal steps of the tube is the same for all the woods of the set.
Claim 8
Dependent Claim
23 words
A matched set of golf clubs according to claim 1, in which at least all the woods have a common frequency of vibration.
Claim 9
Dependent Claim
21 words
A matched set of golf clubs according to claim 7, in which all the irons have a common frequency of vibration.
Claim 10
Dependent Claim
54 words
A matched set of golf clubs according to claim 1, in which the clubs are matched with respect to their moments of inertia, said moments of inertia for each club being measured about a point in the shaft which is a fixed distance from the grip, said distance being the same for each club.
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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) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |