Device Rigging & Wiring Parameters

I’m rigging a mechanical device using wiring parameters and other various controllers in hopes that all the mechanics are controlled by the main component, in my case a trigger pull. Using wire parameters I have all the geared operations controlled successfully. BUT what I can’t figure out is how to have an object link to another after a certain event or collision. Take a look at this animation, what I’m trying to figure out is how to “push” the green box once the dark blue sled comes in contact with it WITHOUT keying separately. My goal is to only animate the main trigger and all the events will happen due to their rigging (see Goal animation - box moved by keying separately). Any suggestions??

http://www.onlinefilefolder.com/index.php?action=getshare&type=0&user\_num=50046&share\_id=237630&hash=aff774052390e074f89530320dca743e

http://www.onlinefilefolder.com/index.php?action=getshare&type=0&user\_num=50046&share\_id=237631&hash=a796c59ce5dd39620e7d4961c0b4fc72

Thanx in advance,

Brian