| 摘要 |
A ball positioned between three circular cross-section bars acting as support. The bars are substantially parallel and oriented generally vertically. One end of each bar is partly restrained but permits full rotation of the bar about its longitudinal axis, but only limited motion laterally. The other bar end is partly restrained by a structure and is controlled by an operator's hand for providing limited bar movement. Two of the bars have handles and the third bar position can be set and remains fixed during a game. The bar cross-section diameters vary lengthwise between bar ends. The ball is urged by means of one specially shaped first bar to move upward against a recall force. A second bar with handle is controlled by another hand. The combination of the variations of the bar diameters and shapes lengthwise with the recall force acting on the ball creates difficulties for the ball to move axially, though urged to do so. The recall force can be generated by gravity and/or a spring, it increases as the ball moves farther from its staring point. The object of the game is to make the ball travel as far as possible from that location. Various coordinated motions of both hands are needed to control the bars and maximize the ball travel, requiring both manual skill and dexterity, which can then be measured and/or improved with practice.
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