Tubular steel racquet frame having varying cross-section
US4561655A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 14, 1984 |
| Grant date | Dec 31, 1985 |
| Priority date | — |
| Expiry date | Jun 14, 2004 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B60/0081
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A steel tubular frame design for racquetball racquets, has a varying cross-sectional structure. This structure gives strength in the lower portion of the racquet so as to reduce the torsional and flexional movements of the frame in that area and has a different cross-sectional area in the upper portion of the racquet where flexibility is needed, providing this flexibility in a continuous one-piece racquet. The invention is characterized by a four-sided peanut-shaped steel tube that has convex corners and two concave sides on the long sides. The convexity and concavity varying at different points throughout the racquet. The racquet frame is of a quadraform/wishbone configuration and is throatless.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.