| 摘要 |
A pneumatic ball propelling device to be used in practicing table tennis is mounted on a separate table near the corner of a playing table. A tube from which balls are propelled one at a time at predetermined intervals has an inlet connected to the outlet of a house-hold vacuum cleaner and an intermediate chute extending upwardly to a receptacle for holding a supply of balls. A gate comprising a notched disk, such as a notched playing record, in the bottom of the receptacle is rotated to release a ball carried within a notch of the disk as the notch passes over the top of the chute. The outer end of the tube has a long strip of resilient material including an outer layer of rubber and an inner layer of plastic foam along its inner wall to impart spin to a ball being delivered. The outer end is rotatably adjustable to control direction of spin and telescopically adjustable to control the path of the ball.
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