Ariel writes – “The sketch and the pictures I posted are of a simple mechanical coin validator – acceptor. it works on the principle that once you insert a coin through a crack that is made according to the exact size of a specific coin. the coin rolls down and fills a slot then by pulling the handle the safety hinge slides over the coin, making it possible to pull the handle all the way back and trigger the timer or any other device connected, once you release the handle the mechanism returns to it’s original position. this coin Validator is based on similar one I found in a Mexican Footbal machine” – Link.
Coin Validator – Acceptor