Tennis ball throwing machine

Details Tennis ball throwing machine Tennis ball throwing machine

1975-07-22

1976-11-09

Stouffer, Richard T.

Mechanical guns and projectors

Fluid pressure

124 41R, 124 45, 124 49, 124 51R, 294 19A, F41F 104, A63B 4702

Patent

active

039904261

ABSTRACT:
Tennis balls are introduced via a removable ball pick-up magazine through a ball port in a wall of a pipe into a stream of air flowing through the pipe towards a barrel. Air flows freely through the barrel and through the ball port past a normally open flexible flap valve which permits a ball to pass, but which momentarily seals against the curved wall of the pipe in response to back pressure after a ball passes through the port and chokes the free flow of air through the barrel.

REFERENCES:
patent: 667580 (1901-02-01), Rogers
patent: 1937828 (1933-12-01), Macdonald
patent: 2760807 (1956-08-01), Watson
patent: 2788630 (1957-04-01), Nisbet
patent: 3371950 (1968-03-01), Stap
patent: 3584614 (1971-06-01), Horvath
patent: 3695246 (1972-10-01), Filippi et al.
patent: 3855988 (1974-12-01), Sweeton
patent: 3905349 (1975-09-01), Nielsen et al.
patent: 3911888 (1975-10-01), Horvath
patent: 3926465 (1975-12-01), Hoagland et al.

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