TODAY’S PATENT – TENNIS BALL THROWING MACHINE
This machine was invented by Jack C. Scott. It was granted patent by the USPTO (US4086903S) on 2nd May 1978.
This machine is used by tennis players during practice.
The purpose basically is that it controllably throws tennis balls simultaneously to the player’s back hand and forehand at various spins and speeds which the player is likely to encounter during game play. It prepares the player for random shots from his/her opponent.
There are various other features such as – an oscillating system to alter the pitches between the forehand and backhand controllably, an elevation adjustment mechanism to alter the height of the delivery or adjusting a random variation in the height, ball spin and speed.