Resources Contact Us Home
System and apparatus for program controlled delivery of game balls

Image Number 7 for United States Patent #4269163.

An ejector for a sequence of game balls has variable device for setting a different trajectory for each ball and for varying the time interval between each ball delivery. A controller includes an input device used by the tennis player or instructor to enter the court and ball data for each of a sequence of balls; a converter for changing the court and ball data to corresponding trajectory data used in setting the ball ejector; and a digital memory for storing the data for each ball. The controller is switched to a programming mode for setting up the court and ball data for the sequence of balls to be delivered and to an operating mode in which the balls are delivered in accordance with the set program.

  Recently Added Patents
Image capture and identification system and process
Satellite fleet deployment
Method for transmitting an electronic short message to multiple receivers
Etching method, etching apparatus, and computer-readable recording medium
Light irradiation element, image forming structure, and image forming apparatus
System and method for evaluating equipment rack cooling performance
  Randomly Featured Patents
Engine control system using a cascaded neural network
Rotatable elastic coupling
System for controlling the printing of electronic documents with various page description languages and other parameters
Elastomer-plastic blends
Magnetometric sensor magnetically isolated two regions formed of spin-polarized material and magnetic head using the same
Efficient use of memory and accessing of stored records
Valved or progressively opening sparger with rigid upper seat
Mobile communication terminal test system capable of visually recognizing communication condition and response signal
Method of packaging mutually reactive substances
Double-cavity heading die