Quote Originally Posted by Tooler2 View Post
A bifold door is hinged at the top and in the middle while the bottom has a roller to run up a track. What is your trolley for?
This one has the hinges vertical Hinged on 1 column and at the 1/3rd mark the door is suspended by the trolley at the 2/3rds mark and pivots on it as the trolley rolls in either direction