Reuleaux triangle intermittent mechanism

grabcad

"why make simple if you can complicate?". I was reading about Reuleaux triangle (constant width) and wanted to do something using this. Then I found a tiny gif (http://imgur.com/gallery/U45Op) that called my attention. The only problem was to find the correct gears, after that it worked perfectly. There is a spring (not seen) to bring the locker back. In the animation, the locker arm is moving slowly because I had to use a damper.