A Google search of "Plug Door Patents" will yeild many variants. The one you want is http://www.google.com/patents/US3051280 which I found by Google Search "Plug Door Patent Boeing"

I also liked this one: http://www.google.ca/patents/US5540404

And This one: see next post

I am going to build one of them as the entrance to my workshop - but I need to get the house built first

A Google search of Plug Door Patents will yield many variants. The ones you want are:

• 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.