Hi. i'm searching for a name of the spring mechanism that snaps-up and snaps-down this type of Switch cover https://cdn.sparkfun.com//assets/parts/6/9/9/0/11310-03a.jpg . on the left side of this red cover, you can clearly see the spring and few other things, that makes it to resist any change of position of the cover, up to a point when spring releases the tension and lets the cover to snap up. same happens when snapping down. i's sure in mechanical engineering it is a very known mechanism, and has a technical name like "snap-up tension spring" or "button snap spring" or something. so could anyone tell me it's name?