发明名称 |
Tennis ball collection, pick-up and propelling system |
摘要 |
A tennis ball retrieving and propelling device for placement on a surface having a ball delivery tube and a carrousel type ball retriever positioned below the ball delivery tube for receiving balls to be pneumatically transported to the ball delivery tube. The delivery tube is provided with a mechanism for constricting the effective cross sectional area thereof. The mechanism is provided with a releasing element for releasing the constriction to permit a ball to be pneumatically propelled through the tube. The mechanism includes a section of flexible tubing attached to the delivery tube, a cable surrounding the flexible tubing and a device attached to the cable for tensioning and releasing the cable to restrict and release a ball traveling through the flexible tube. The balls are pneumatically retrieved and propelled from the propelling device. The propelling device has elements for controlling the speed, azimuth and elevation of a ball delivered therefrom.
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申请公布号 |
US4046131(A) |
申请公布日期 |
1977.09.06 |
申请号 |
US19750641080 |
申请日期 |
1975.12.15 |
申请人 |
AMERICAN TENNIS SYSTEMS, INC. |
发明人 |
CLARK, THOMAS S.;KENNEDY, WILLIAM S.;PIZIALI, ROBERT L. |
分类号 |
A63B47/02;A63B69/40;(IPC1-7):F02B33/10 |
主分类号 |
A63B47/02 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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