Single action spring hinge:A spring hinge has a spring in its “knuckle”, which is larger than usual. The spring is linked to one flap at the top and the other flap at the bottom. Therefore, when the door opens, the spring is wound up, as the two flaps rotate apart. When the door is released, the sp

Double Action Spring Hinge refers to the opening of a door that allows an interior door to be opened in both directions. Other names for double action spring hinge are as follows: Cafe door hinges, Saloon door hinges, and Double swing door hinges.