Mechanical guns and projectors – Fluid pressure – With control for discharge of fluid pressure
Patent
1975-12-15
1977-09-06
Pinkham, Richard C.
Mechanical guns and projectors
Fluid pressure
With control for discharge of fluid pressure
124 41R, 124 51R, 124 51A, F02B 3310
Patent
active
040461319
ABSTRACT:
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.
REFERENCES:
patent: 2508461 (1950-05-01), Lemon
patent: 2526018 (1950-10-01), Foster et al.
patent: 2574408 (1951-11-01), Moe
patent: 3855988 (1974-12-01), Sweeton
patent: 3917265 (1975-11-01), Schrier et al.
Clark Thomas S.
Kennedy William S.
Piziali Robert L.
American Tennis Systems, Inc.
Brown T.
Moore Gerald L.
Pinkham Richard C.
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