US4580785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Golf club
Assignee: Individual
•
Filing: 1984-11-30
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Granted: 1986-04-08
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Expires: 2004-11-30
Abstract
Abstract A golf club is provided which will enable a golf player to easily determine when he has executed an improper swing known as a "twist swing". The golf club of the present invention is characterized by a hollow, circular readily flexible shaft provided with a conventional wood or metal club head at one end and a grip at the other end with a flexible, thin, flat metal leaf or strip fixedly positioned within the hollow shaft for substantially its entire length with the width thereof corresponding to the internal diameter of the shaft. The metal leaf is placed in an alignment with the shaft such that when a "twist swing" is created the metal leaf will be torsionally twisted along its longitudinal axis and will create a rubbing sound and cause vibration to the shaft. '
Inventors
- 👤 Masateru Toku
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:54
CPC Classifications
A; A63; A63B; A63B69/00; A63B69/36; A63B69/3623; A63B69/3632; A63B69/3635
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
228 words
A golf club for determining the existence of a "twist swing " when used comprising a hollow, circular shaft made of a material which provides flexibility to said shaft in any direction, a golf club head having a striking face secured in operating relationship to one end of said shaft, a grip secured to the opposite end of said shaft in encircling relationship therearound, an elongated thin, flat metal leaf inserted within said shaft, said leaf having a high degree of flexibility along its longitudinal axis and a width corresponding substantially to the internal diameter of said shaft with the side edges of the metal leaf engaging the internal surface of the shaft at diametrically opposite points and being of a length corresponding generally to the length of said shaft, and securing means mounted within the opposite ends of said shaft to secure each end of said metal leaf within said shaft, said metal leaf when positioned with said shaft having its wide sides in substantially longitudinal alignment with the striking face of said club head whereby upon the creating of a "twist swing" by a user of the golf club, said metal leaf will have a torsional twist created along its longitudinal axis causing the metal leaf to engage the inner wall surface of said shaft thereby creating a sliding noise and imparting vibration to said shaft.
Claim 2
Dependent Claim
228 words
A golf club for determining the existence of a "twist swing " when used comprising a hollow, circular shaft made of a material which provides flexibility to said shaft in any direction, a golf club head having a striking face secured in operating relationship to one end of said shaft, a grip secured to the opposite end of said shaft in encircling relationship therearound, an elongated thin, flat metal leaf inserted within said shaft, said leaf having a high degree of flexibility along its longitudinal axis and a width corresponding substantially to the internal diameter of said shaft with the side edges of the metal leaf engaging the internal surface of the shaft at diametrically opposite points and being of a length corresponding generally to the length of said shaft, and securing means mounted within the opposite ends of said shaft to secure each end of said metal leaf within said shaft, said metal leaf when positioned with said shaft having its wide sides in substantially longitudinal alignment with the striking face of said club head whereby upon the creating of a "twist swing" by a user of the golf club, said metal leaf will have a torsional twist created along its longitudinal axis causing the metal leaf to engage the inner wall surface of said shaft thereby creating a sliding noise and imparting vibration to said shaft.
Claim 3
Dependent Claim
25 words
A golf club in accordance with claim 1 wherein said shaft is composed of synthetic resin mixed with fiberglass to form a conventional fiberglass shaft.
Claim 4
Dependent Claim
13 words
A golf club in accordance with claim 2 wherein said head is wood.
References Cited (Backward Citations)
US1131486A
Cited
US3612121A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-04-07 | 1989-10-07 | 1990-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-07 | 1993-10-07 | 1994-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-07 | 1997-10-07 | 1998-04-08 | $7700.00 | Window Closed / Lapsed |