Golf club shaft
US4591157A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 1984 |
| Grant date | May 27, 1986 |
| Priority date | — |
| Expiry date | Sep 4, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2209/02
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A golf club shaft having a bored outer wood hollow tube and having an inner non-wood hollow tube positioned inside and closely fitting the interior bore of the outer tube. An adhesive between the tubes bonding them together. The inner tube having at least one step increasing its exterior diameter and creating an upper larger diameter portion above the step that is less flexible and creating a lower lesser diameter portion below the step that is more flexible. The outer wood tube being counter-reamed creating a portion of greater interior diameter matching the location of the less flexible upper portion of the inner tube above the step and leaving a portion of lesser diameter not counter-reamed matching the location of the more flexible portion of the inner tube below the step.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.