Tennis racket with equal string lengths
US4834383A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 11, 1987 |
| Grant date | May 30, 1989 |
| Priority date | — |
| Expiry date | Sep 11, 2007 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2049/0217
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A tennis racket has an elongated handle defining a longitudinal main axis and having an outer end and an annular frame fixed to the outer handle end and bisected by the axis. The frame has an arcuate crown concave toward the handle and an arcuate throat concave toward the handle and of substantially the same transverse size and curvature as the crown. The crown and throat are formed with respective longitudinally aligned sets of longitudinally throughgoing and transversely spaced holes. In addition the frame has a pair of sides substantially symmetrically flanking the axis and longitudinally bridging the crown and throat. These sides are formed with respective transversely aligned sets of transversely throughgoing and longitudinally spaced holes. The crown and sides together define an oval outer periphery. The side holes open outward at their outer ends into respective outwardly open grooves in the sides of the frame. Main strings extending longitudinally between respective holes of the crown and throat substantially parallel to the axis and cross strings extending transversely generally perpendicular to the axis between respective holes of the sides together define a central spot …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.