Constant wall shaft with reinforced tip
US4961576A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 23, 1988 |
| Grant date | Oct 9, 1990 |
| Priority date | — |
| Expiry date | Nov 23, 2008 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB21K17/00
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A hollow metallic shaft for sporting implements includes a cylindrical tip section having a first constant wall thickness, a shank section including a tapered portion and having a second constant wall thickness, and a cylindrical portion located adjacent the tapered portion and opposite the tip section. An increase in wall thickness provides additional reinforcement at the tip section. The method of making the shaft includes an initial rotary swaging of an end portion of the shaft followed by a series of sink drawing operations to form a stepped contour on the outer periphery of the shaft. A final rotary swaging of the stepped contour provides the shaft with a smooth taper towards one end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.