Ball-throwing device with ball throwing heads and ball conveying system including Y-junction
US4559918A · kind A · utility
31Cited by
15References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 19, 1983 |
| Grant date | Dec 24, 1985 |
| Priority date | — |
| Expiry date | Apr 19, 2003 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2102/16
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Balls such as table tennis balls or tennis balls are continuously fed to two pairs of adjacent flanged rollers of a ball-throwing head by a blower and two transfer ducts. Balls hit by the player are collected by a net and a trough, then fed back to the head. The rollers have separately variable speeds of rotation, a gap being provided between each pair of rollers and adapted to the diameter of the balls. The balls are directed alternately into each transfer duct, the opening of which is located opposite to each gap.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.