| 摘要 |
The ball delivery device includes an enclosed non-transparent delivery conduit extending outwardly from a substantially vertical support structure. The enclosed non-transparent delivery conduit includes a ball receiving portion at one end and a ball discharging portion terminating at a discharge opening at an opposite end. The entire length of the ball delivery conduit including the ball discharge portion is enclosed and made from a non-transparent material to prevent the player from viewing the ball until it is discharged for the opening. The delivery conduit may be pivotally connected to the support structure so that an adjustable positioning rod positioned between the support structure and the conduit can be adjusted to vary the angular position of the conduit. Alternatively, the delivery conduit may be stationary with respect to the support structure at an angle just sufficient to cause the ball to travel therethrough by the force of gravity. The discharge portion may be formed from non-transparent rigid tubing rotatably connected to the delivery conduit to provide a simple and effective means for allowing the player to vary the speed and trajectory of each pitch or series of pitches.
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