A Google search of "Plug Door Patents"Plug Door Patents will yeildyield many variants. The oneones you want is http://www.google.com/patents/US3051280 which I found by Google Search "Plug Door Patent Boeing"
I also liked this oneare: http://www.google.ca/patents/US5540404
And This one: see next post
- Outward-opening plug type door for aircraft
- Double-decked aircraft with plug door
- Folding, plug type aircraft door
I am going to build one of them as the entrance to my workshop - but I need to get the house built first.