Ball projectile machine
US4721091A · kind A · utility
Inventors
Key dates
| Filing date | Apr 3, 1986 |
| Grant date | Jan 26, 1988 |
| Priority date | — |
| Expiry date | Apr 3, 2006 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B69/408
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A ball projecting machine comprises a ball striker in the form of a bar secured to a shaft rotatably mounted by bearings in a part of a machine frame. The striker carries a pin on the same side of the shaft as the end of the striker which strikes the balls. A tension spring is connected between a fixed part of the machine frame and the pin to bias the striker. The striker shaft is arranged to be rotated by a manually operated lever so that during a cycle of rotation of the striker in the striking direction, the tension spring is stressed during a first part of the cycle and during a second part of the cycle urges the striker to rotate in the striking direction. The lever is connected to the shaft through a first one-way clutch including a coil spring and drums fixed respectively to the lever and to the shaft. The shaft is connected to the machine frame part through a further one-way clutch including a coil spring and drums fixed respectively to the frame part and to the shaft. The arrangement is such that the manual rotation of the lever rotates the striker against the tension spring until the over-center position of the spring is reached, whereafter the striker rotates rapidly in …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.