What is a Balanced Door?
A balanced door is a kind of swing door mostly used as an exterior entrance door in a public or commercial building. It is different from all kinds of hinge doors as its unique hardware and mechanical design allow itself to bear and efficiently operate a tall and heavy door leaf. The pedestrians can open it easily without much pulling or pushing force, and the door leaf can make a full close by itself.
The reason making it a “balanced” door is that the exterior wind pressure is distributed by its unique swing path, the location of the door swing fulcrum point makes the door open with ease by leverage and the pivot spring force overcomes the interior stack pressure to fully close the door.
1. When opening the door, the wind pressure is distributed to inside through the gap on the hinge side and on the edge side the stack pressure push back to accelerate the door open.
2. The required door opening force is only half to two third of regular force.
3. The torsion bar provides closing force against the stack pressure and fully closes the door.
4. The door retracts while opening and saves one third of door width taking exterior public space when fully opened.
5. Reduced waving radius to fasten opening/closing speed.
6. No entrance traffic jam with larger door size.
1. Door opening force against the entire door weight and wind.
2. The internal stack pressure makes it hard to keep the door fully closed.
3. The full waving radius takes much time to a full opening and takes much exterior public space to cause entrance traffic jam.