The introduction assumes type 1A is the strongest. I say it is the most secure, but not necessarily the strongest:
All of the 2 types are least secure because anyone with a floor jack could [having achieved access of course], lift the hinge off the pins, leaving the door hanging from nothing but the locking bolts. All but 2D would however bear the weight of the door when opened, better than any of type 1. 2D would kill you as fast as 1D
Type 1A is not as strong physically, but it prevents the type 2 flaw [mentioned above] when closed and carry’s all of the door’s weight best when open. When open it would allow the door to be lifted off the center pins.. but what would you do with a loose door on your … hands?
Type 1B is physically weaker both open and closed because the weight is all only on the bottom block which causes more work and wear on those bearings.
Type 1C is bad for the same reasons as 1B
Type 1D would simply drop the door on you as soon as it is opened. Not good. 🙁giggle):
Oh, and type 4! That hands you both the door and the hinge crane without invitation. DO NOT OPEN THOSE DOORS !!!!
