Swing gates swing open like the door to your bedroom or bathroom might, simply opening inward or outward. Swing gates can use three types of operators.
A swing arm operator, which is a box, that sits off to the side and has an arm extending to the gate. A ram arm is located on the gate and post and uses either a hydraulic piston or a jackscrew-operated piston.
Underground operators are located by the hinge and operate the gate via a link arm.