| 摘要 |
A ball throwing machine which includes a pair of rotary discs supported for rotation in angularly opposed relation so as to laterally engage a ball and effect propulsion thereof, each disc being composed of a back-up plate with an annular groove and a flat resilient section thereover, the discs being mounted on connected shafts enabling rotation by a single prime mover, and being capable of offset connection so that the ball will be engaged by the discs at different radial positions.
|
