System and apparatus for program controlled delivery of game bal

Mechanical guns and projectors – Fluid pressure – With control for discharge of fluid pressure

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Details

273 29A, 364410, A01B 6512, A01B 6938, F41F 104

Patent

active

042691630

ABSTRACT:
An ejector for a sequence of game balls has variable device for setting a different trajectory for each ball and for varying the time interval between each ball delivery. A controller includes an input device used by the tennis player or instructor to enter the court and ball data for each of a sequence of balls; a converter for changing the court and ball data to corresponding trajectory data used in setting the ball ejector; and a digital memory for storing the data for each ball. The controller is switched to a programming mode for setting up the court and ball data for the sequence of balls to be delivered and to an operating mode in which the balls are delivered in accordance with the set program.

REFERENCES:
patent: 2831402 (1958-04-01), Taslitt
patent: 3618456 (1971-11-01), Mindel
patent: 3807379 (1974-04-01), Vodinh
patent: 4008893 (1977-02-01), Yoseloff
patent: 4020407 (1977-04-01), Clement et al.
patent: 4021036 (1977-05-01), Nelson et al.
patent: 4046131 (1977-09-01), Clark et al.
patent: 4086903 (1978-05-01), Scott

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