Here is the hinge idea I came up with to have the roof open widely, but not hit the steam dome for the Climax locomotive model I am building. Another requirement is that the roof can stay in the open position for access to the backhead.
The scissor action lifts and swings the roof back from the steam dome as it opens. By design, the maximum opening occurs when one of the scissor arms is vertical. The small swing link at the rear of the roof is parallel to the roof line at this inflection point. From this point, you can lower the roof slightly in a propped open position caused by the scissor arm pressing on the roof, or you can swing the link in the other direction to close the roof.
Any thoughts? Are there simpler ways to achieve the same result? A simple pivot from the forward corner would let the roof hit the steam dome.
Ed
The scissor action lifts and swings the roof back from the steam dome as it opens. By design, the maximum opening occurs when one of the scissor arms is vertical. The small swing link at the rear of the roof is parallel to the roof line at this inflection point. From this point, you can lower the roof slightly in a propped open position caused by the scissor arm pressing on the roof, or you can swing the link in the other direction to close the roof.

Any thoughts? Are there simpler ways to achieve the same result? A simple pivot from the forward corner would let the roof hit the steam dome.
Ed