Coacting wheel ball emitting device of tennis training system

Details Coacting wheel ball emitting device of tennis training system Coacting wheel ball emitting device of tennis training system

1980-01-23

1982-04-20

Pinkham, Richard C.

Mechanical guns and projectors

Projectile impelled by coacting wheels

124 51A, 124 81, F41B 1500

Patent

active

043253512

ABSTRACT:
A tennis ball emitting or serving device includes a ball emitting cylinder having controllable horizontal and vertical angles. The ball is driven by contact with the peripheral surfaces of rotating ball emitting wheels or pulleys. To impart various directions and speeds of spin to the ball, the ball emitting wheels may be rotated at various speeds and the axes of the wheels may be independently disposed at variable angles.

REFERENCES:
patent: 3538900 (1970-11-01), Samuels
patent: 3794011 (1974-02-01), Newgarden
patent: 4086903 (1978-05-01), Scott

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