Importance

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Abstract

A device for propelling tennis balls has an oscillating discharge barrel to which balls are fed from a rotating distributor. A programmed relationship is provided, including a motion-translating linkage oscillating the barrel as an extension of the mechanism used for rotating the distributor. Programming is achieved to cause a predetermined number of objects to be propelled from the barrel, during each oscillatory cycle, as a direct response to rotation of the distributor. The linkage can be optionally provided without changing the basic design of propulsion devices heretofore made. The invention provides this through an extension shaft of the distributor, which rotates a member having openings spaced different radial distances from the axis of rotation of the member. A drop pin is extendable through any of the openings, and through a slot of a motion-translating link connected to a support bracket for the barrel. Vertical adjustment of the barrel, selective adjustment of its angular travel, selective blocking out of distributor feed openings, and a selected drive ratio between the distributor and the motion-translating means combine to effect a wide range of discharge programs. Further variation is achieved by selecting various angular relationships between openings of the motion-translating member, and openings of the distributor.

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First Claim