http://www.google.com/patents/about?id=pns7AAAAEBAJ&dq=lift+chair
I THINK THIS IS THE ONE
http://www.google.com/patents/about?id=pns7AAAAEBAJ&dq=lift+chair
Each member should come up with a mechanism with all its specifications written by monday evening. It would be then easy to merge all 5 to present as 5 alternative mechanisms. and then we can come down to one by comparing them. Most probably we will have a meeting on Monday. It is better that each one should post on the group what he finds, it will be a to help other members.