Mechanical guns and projectors – Projectile impelled by coacting wheels
Patent
1976-04-13
1978-05-02
Oechsle, Anton O.
Mechanical guns and projectors
Projectile impelled by coacting wheels
318 67, 318 99, A63B 6940
Patent
active
040869032
ABSTRACT:
A tennis ball throwing machine for use in the practice of tennis having the capability of controllably delivering tennis balls to a player's forehand and backhand at various speeds and with various spins simulating conditions commonly encountered in game play. The machine has a pair of wheels which are independently and controllably driven so as to throw a tennis ball delivered therebetween by an automatic ball feed mechanism at a speed and with a spin determined by the speed of each of the wheels. Various features include an oscillating system to alternate pitches between the forehand and backhand in a controllable manner, an elevation adjustment mechanism for controllably varying the height of the delivery or providing a random variation in such height, and independent ball speed and ball spin controls. Remote controls for the machine may be provided.
REFERENCES:
patent: 2698442 (1955-01-01), Travis
patent: 3421491 (1969-01-01), Brown
patent: 3610223 (1971-10-01), Green
patent: 3646414 (1972-02-01), Gurwicz
patent: 3724437 (1973-04-01), Halstead
patent: 3777732 (1973-12-01), Holloway et al.
patent: 3794011 (1974-02-01), Newgarden
patent: 3913552 (1975-10-01), Yarur et al.
patent: 3962615 (1976-06-01), Spangler
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