Tennis Ball Launcher: Build a Mechanical Launcher

[aga78]

I have a project which consists in making a tennis ball launcher for training kids (6-12 years), but there is a catch, the mechanism can't have any elastic parts (springs, bands, rubber). It has to be purely mechanical. I need help

 

[berkeman]

Welcome to the PF.

This sounds like a schoolwork assignment, no? If so, please start a new thread in the Homework Help forums and fill out the Template there showing your work on this so far. Thanks.

 

[berkeman]

Also, for when you re-post, please show what you have found with your searching so far. Google Images is a great tool for initial searching for things...

http://s60.radikal.ru/i169/1407/f1/7ab204974a8f.jpg