Convertible baseball and tennis practice machine

Details Convertible baseball and tennis practice machine Convertible baseball and tennis practice machine

1974-06-17

1976-01-06

Pinkham, Richard C.

Mechanical guns and projectors

Spring

Elastic band

124 30R, 124 34, 124 49, F41F 104

Patent

active

039304868

ABSTRACT:
An improved compressed fluid ball projecting machine convertable for baseball and tennis practice. Improvements are in maneuverability, oscillation of the tennis barrel and immobility of the baseball barrel, remote control power for coaching options, replaceable and interchangeable barrels, variable timer speed control and a reliable hopper and feed system to enable firing of up to two hundred tennis balls unattended and without malfunction. Regarding the oscillation or lack of oscillation of the barrel, an actuator rod mounted on a rotatable disc causes such oscillation. When this rod is removed and the barrel clamped, this oscillation is eliminated. Concerning the variable timer control, such control is varied by two relatively movable rotatable notched discs. These dics contact a valve actuating mechanism and permit opening of a valve operated thereby only when the notches of the pair of discs are aligned and in contact with the valve actuating mechanism.

REFERENCES:
patent: 592221 (1897-10-01), Wells et al.
patent: 3018769 (1962-01-01), Parsoneault
patent: 3277879 (1966-10-01), Sayette
patent: 3467073 (1969-09-01), Rhodes
patent: 3568653 (1971-03-01), Earle, Jr. et al.
patent: 3585978 (1971-06-01), Hurlimann
patent: 3602208 (1971-08-01), Hurlimann
patent: 3640263 (1972-02-01), Rhodes
patent: 3724437 (1973-04-01), Halstead

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