Patent US5004236A successfully refreshed from Google Patents.
US5004236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Balance shaft
Assignee: Individual
•
Filing: 1988-08-16
•
Granted: 1991-04-02
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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 15:23
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.
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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) | 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 |