| 摘要 |
Tennis balls are propelled to a person practicing the game. The balls are propelled by a head that is vertically repositionable and horizontally aimable. The apparatus includes a main frame, including an attached control box, having a dual hinge; a deformable parallelogram lifting arm, having a first end and a second end, attached at its first end to the dual hinge on the main frame; a movable vertically extending member, rotatably receiving and supported by the second end of the lifting arm at a first end; an oscillating bracket, disposed at a second end having at least one upwardly extending arm, rotatable around a vertical axis; a ball propulsion device mounted on the oscillating bracket to be horizontally rotatable; and a feed support attached to the oscillating bracket above the ball propulsion device providing a source of balls for the ball propulsion device.
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