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Propulsion device for spherical objects having an oscillating support frame providing a programmed discharge of said objects
| Details |
Inventors: Bash, C. Malcolm; Pasquito, Joseph;
Assignee: Prince Manufacturing Co., Inc. (Princeton, NJ)
Primary Examiner: Stouffer; Richard T.
Assistant Examiner:
Attorney, Agent or Firm: Kane; John J., Zoda; Frederick A., Sperry; Albert
A propulsion device, designed especially but not necessarily solely for propelling tennis balls for training purposes, has in common with earlier devices a rotary distributor or magazine, feeding balls in successively following order into a discharge conduit. The balls are discharged through a barrel which is mounted upon the housing of the equipment for adjustment about a transverse axis, thus to dispose the barrel at selected positions of inclination, to vary the trajectory of the ball when propelled, with the adjustment being preserved after selection by the user. An improved oscillatory motion is imparted to the entire device, hence to the barrel, following adjustment of the barrel to the selected position of inclination. The oscillatory travel is adapted to be programmed, that is to say, in oscillating the entire structure bodily, adjustments can be made that will permit pre-selection of the number of tennis balls to be propelled during each oscillatory cycle, other adjustments can be made with respect to the angle at which the discharge barrel is inclined, further adjustments can be made as to the width of the area within which the balls will drop, and still other adjustments can be made for pre-selection of a ball-drop pattern within a given width of training area. All of the adjustments can be effected singly or in any desired combination thereof, according to the training needs of the particular user. |
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DETAILED DESCRIPTION Summarized briefly, the improvement comprising the present invention is incorporated in a propulsion device of the type disclosed and claimed in U.
S.
Pat.
No.
4,027,646.
That device includes a portable housing, containing a pressurizing chamber and a ball feed hopper located above said chamber.
A rotary distributor mounted in the bottom of the hopper has a series of angularly spaced ball-receiving sleeves through which the balls are fed from the hopper.
As the distributor rotates, it passes over a feed opening extending into the pressurizing chamber.
The balls are thus successively delivered from the distributor into the chamber.
Within the chamber they are directed in following order into a receiver and are then discharged forcibly from a barrel mounted upon the front end of the pressurizing chamber for adjustment about a horizontal transverse axis.
The oscillating mechanism disclosed in the abovementioned U.
S.
Pat.
No.
4,233,953 is incorporated in a propulsion device having the same general characteristics as that of U.
S.
Pat.
No.
4,027,646, but which differs from the device of the latter patent in that the barrel is located at the top of and toward the rear end of the ball feed hopper.
The oscillating mechanism of the parent application is adapted to permit a wide range of programmed or pre-selected ball-drop patterns, including pre-selection of an adjusted width of training area, programming of the ball drop pattern within any of said pre-selected areas, selection of the number of tennis balls to be propelled in a single oscillatory cycle, and pre-selection of the angle or trajectory at which the balls are discharged.
The present invention incorporates all the advantages of the oscillating mechanism of the parent application, in a propulsion device of the type shown in the above-mentioned U.
S.
Pat.
No.
4,027,646.
To this end, the present invention includes, in association with a propulsion device of the kind shown in said patent, a stationary support foot, to which is swivelly connected the lower end of a crank element rotatably mounted on the rear walls of the pressurizing chamber and ball feed hopper, a link pivotally connected to the crank element above the hopper, a rotary member to which the link is connectible at selected locations on said member, and a means of connecting the rotary member to the ballfeed distributor for rotation therewith
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