| 摘要 |
A new and improved portable pitching aid with a hollow base portion having a support bar extending from one portion to an opposing portion. A hollow outer vertical support bar is integral with a midpoint of the support bar of the hollow base portion. A hollow inner vertical support bar is slidably received within the hollow outer vertical support bar. An adjustment means adjusts the height of the inner vertical support bar within the outer vertical support bar. An outer hollow U-shaped frame is integral with the hollow inner vertical support bar. An inner hollow inverted U-shaped frame is slidably received within the outer hollow U-shaped frame. An adjustment means adjusts the height of the inner hollow inverted U-shaped frame within the outer hollow U-shaped frame.
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