| 摘要 |
A ball projecting apparatus is described, including a spring biased plunger for striking a hollow ball positioned within a guide tube to project the ball out of such tube. The ball projecting apparatus is useful as a baseball hitting trainer. An adjustment device is provided for changing the position where the plunger inpacts that ball to enable the path of the ball to curve to the left or right to simulate baseball pitching. Also the top half of the guide tube is removed to reduce its resistance to lateral spin of the ball across its direction of travel. In one embodiment, the plunger impact position is adjusted by changing the angle of the plunger shaft relative to the ball guide tube axis. In another embodiment, this adjustment is achieved by supporting the plunger shaft substantially parallel to the guide tube axis but spaced therefrom and rotating such plunger shaft about such axis into different rotational positions relative to the center of the ball.
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