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
Buried object detection in GPR images
Electromagnetic sensor cable and electrical configuration therefor
Retrievable outgoing audio messaging
MEMS autofocus actuator
Load control device
Method for media access controlling and system and method for channel time reservation in distributed wireless personal area network
Integrated circuit having a discrete capacitor mounted on a semiconductor die
  Randomly Featured Patents
Profiling frequencies of receptor heterodimers
Integrated sensor including a pressure sensor and a temperature sensor
Forecasting with parallel processing
Monoclonal antibody-platinum co-ordination compound complex
Position difference detecting device and method thereof
Fiber reinforced ceramic matrix composite internal combustion engine intake/exhaust port liners
One-way clutched damper for automatic belt tensioner
Efficient characterization of symmetrically illuminated symmetric 2-D gratings
Caller identification verification system
Vector floating point unit