| 摘要 |
A vertical post having upper and lower sections and the upper section is telescopically positioned in the lower section, and has upper and lower components. The upper end of the lower component and the lower end of the upper component being engaged at an angle offset from the horizontal; a base is provided to support the vertical support. The upper and lower post sections has a plurality of complementary horizontally extending and vertically spaced apertures, a pen for extending through aligned apertures and adjusting the upper post section relative to the lower post section. A plate attached to the upper end of said support and a horizontal rod having one end attached to the plate and a ball attached to its other end. A spring member in the support for biasing the upper section towards the lower section to automatically return the ball to an initial position after being hit.
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