US5004236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balance shaft
Assignee: Individual
•
Filing: 1988-08-16
•
Granted: 1991-04-02
•
Expires: 2008-08-16
Abstract
Abstract A balance shaft is comprised of cylindrical members provided inside a golf shaft at appropriate points to give the golf-shaft an ideal whippiness and ensure the club-head makes accurate contact with the ball.
Inventors
- 👤 Makoto Kameshima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:31
CPC Classifications
A; A63; A63B; A63B60/00; A63B53/00
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A golf club, comprising a balance shaft having a first and a second end, a club head attached to the first end and a grip attached to the second end, said balance shaft comprising a hollow tubular club-shaft having an inner diameter, and at least one substantially cylindrical member within the club-shaft, each of said at least one cylindrical member having a tapered surface so as to form a large-diameter portion and a small-diameter end, only the large-diameter portion being fixed to the club-shaft, the small-diameter end having a diameter smaller than the inner diameter of the club-shaft and being located closer to the first end than is said large-diameter portion; so that, when said hollow tubular club-shaft bends during operation an inner surface of said tubular club-shaft contacts said tapered surface of said at least one cylindrical member to control the whippiness of said golf club.
Claim 2
Dependent Claim
147 words
A golf club, comprising a balance shaft having a first and a second end, a club head attached to the first end and a grip attached to the second end, said balance shaft comprising a hollow tubular club-shaft having an inner diameter, and at least one substantially cylindrical member within the club-shaft, each of said at least one cylindrical member having a tapered surface so as to form a large-diameter portion and a small-diameter end, only the large-diameter portion being fixed to the club-shaft, the small-diameter end having a diameter smaller than the inner diameter of the club-shaft and being located closer to the first end than is said large-diameter portion; so that, when said hollow tubular club-shaft bends during operation an inner surface of said tubular club-shaft contacts said tapered surface of said at least one cylindrical member to control the whippiness of said golf club.
Claim 3
Dependent Claim
30 words
A golf club as claimed in claim 1, wherein said large-diameter portion of each of said at least one cylindrical member is located at an end opposing said small-diameter end.
Claim 4
Dependent Claim
60 words
A golf club as claimed in claim 1, wherein said large-diameter portion of each of said at least one cylindrical member is located in a center portion of the cylindrical member, and each of said at least one cylindrical member is tapered so as to further comprise a second small-diameter end located at an end opposing the first small-diameter end.
Claim 5
Dependent Claim
24 words
A golf club as claimed in claim 1, wherein each of said at least one cylindrical member is made of a high-tensile non-elastic material.
Claim 6
Dependent Claim
44 words
A golf club as claimed in claim 1, wherein the club-shaft has a kick-point and a grip portion, and wherein the club comprises one of said cylindrical members located at the kick point and one of said cylindrical members located at the grip portion.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-01 | 1994-10-01 | 1995-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-01 | 1998-10-01 | 1999-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-01 | 2002-10-01 | 2003-04-02 | $7700.00 | Window Closed / Lapsed |