Articulated gate openers ( for example: MIGHTY MULE 560 ) can be used for gates with wide posts allowing opening in small spaces. An easy system for DIY installers as they are simple to install but not as aesthetically pleasing as other motor designs. Also known as Crank arm operators, they are the main type of automation system sold in France, where low aluminium gates are often used.
Under-gate Jack operators usually control the gate by directly moving the pivot point of each gate leaf. This makes the unit ideal cosmetically and also allows for up to 180 degrees of leaf swing as required. However controlling the pivot point of the gate, is like opening a door by twisting the hinge, and as so is very difficult due to the loads needed at that point. This is highlighted with snap, as the gate has to change direct, as soon as it can. For this reason they are recommend as only suitable for ‘Domestic’ systems in a low risk of abuse environment. Another major consideration with the use of under-gate units is that of water immersion/ingress and warranty voidance. If the water table is high or the drainage of the unit’s foundation box inadequate throughout the systems life, then water ingress and unit failure is increased.
Ram or link arm units are usually simpler to install and maintain, they are visible to otherwise ignorant abuse and as they fix down along each gate leaf, they also have an obvious and sometimes major, mechanical advantage over Jacks. Therefore, Rams are far more suitable on Multi-user & commercial systems. Also the manual release is always above ground, making it often more user friendly in operation.
If space is an issue or the driveway behind the gates is on a steep incline, a better option would be a sliding gate. Sliding gates are also very popular in a commercial environment. Sliding gates are also used for cantillever gate systems.