Pump jack scaffolding details

I was pretty interested in pump jack that was used in the residential construction site. It was safe and easy to use in small construction site. A plank is simply raised by using workers' foot to pump the jack. Here is the detailed description from a website. It is mostly composed of aluminum poles, pump jacks, wall braces, and work benches.

-Maximum Capacity : 500 lbs
-Maximum height : Wood poles: 30' height
                             Metal poles: 50' height.
From <http://www.wernerladder.com/catalog/files/rc154.pdf>