| 摘要 |
A mounting plate includes a plurality of support cylinders mounted orthogonally to the mounting plate, wherein each support cylinder is arranged to receive a baseball at its upper end. Each cylinder is of a tubular construction to accommodate the baseball sphere and each cylinder including a coil spring mounted therewithin, with each coil spring including a plurality of spring rods fixedly mounted to adjacent coils of the spring. One of the spring rods is arranged for receiving a hook member, a lower distal end of the hook member secured to a suction cup. The suction cup is initially adhered to the mounting plate within the lower distal end of the cylinder, and each suction cup of each support cylinder arranged for randomly releasing the spring to project the spring upwardly to project the associated baseball from the support cylinder with an axial of an individual attempting to strike. A modification of the invention includes the plate adjustably mounted relative to an underlying support in an angular orientation thereto, and further including an adjuster mechanism to alter adherence of each suction cup relative to the mounting plate.
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