US4852880A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head structure for gold clubs
Assignee: Endo Manufacturing Co Ltd
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Filing: 1988-02-17
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Granted: 1989-08-01
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Expires: 2008-02-17
Abstract
Abstract A head structure for a golf club, has a head body having a face for providing a ball hitting surface and a balancing weight made denser than the head body which is press-fitted so firmly on the head body that it may not come out. The press-fitting is accomplished by a combination of dovetail joint or the like. The dovetail joint includes a fitting mortise flaring towards its bottom and extending longitudinally of one of the head body and the balancing weight, and a corresponding fitting tenon flaring to have a width diminishing towards its root and extending longitudinally of the other so that it may be firmly fitted in the mortise.
Inventors
- 👤 Kenji Kobayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:19
CPC Classifications
A; A63; A63B; A63B53/00; A63B53/04; A63B53/047; A63B60/00; A63B53/0416; A63B53/0466
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
165 words
A head structure for a golf club, comprising: a head body having a face for providing a ball hitting surface; a balancing weight made denser than said head body; means for press-fitting said balancing weight so firmly on said head body that it may not come out, said means including a fitting mortise flaring towards its bottom and extending longitudinally of one of said head body and said balancing weight, and a corresponding fitting tenon flaring to have a width diminishing toward its root and extending longitudinally of the other so that it may be firmly fitted in said mortise, and wherein said fitting mortise and tenon are narrowed from the heel to the toe of said head body partly to retain said tenon in said mortise while preventing said balancing weight from coming out against the centrifugal force which is established when said golf club is swung and partly to displace the position of the overall centroid of said head structure toward said heel.
Claim 2
Dependent Claim
165 words
A head structure for a golf club, comprising: a head body having a face for providing a ball hitting surface; a balancing weight made denser than said head body; means for press-fitting said balancing weight so firmly on said head body that it may not come out, said means including a fitting mortise flaring towards its bottom and extending longitudinally of one of said head body and said balancing weight, and a corresponding fitting tenon flaring to have a width diminishing toward its root and extending longitudinally of the other so that it may be firmly fitted in said mortise, and wherein said fitting mortise and tenon are narrowed from the heel to the toe of said head body partly to retain said tenon in said mortise while preventing said balancing weight from coming out against the centrifugal force which is established when said golf club is swung and partly to displace the position of the overall centroid of said head structure toward said heel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-07-31 | 1993-01-30 | 1993-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-07-31 | 1997-01-30 | 1997-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-07-31 | 2001-01-30 | 2001-08-01 | $7700.00 | Window Closed / Lapsed |