Abstract: The present invention includes a portable lifting device for use on a temporary basis to lift objects up to, or to lower down from, an elevated height, particularly a roof of a multi-story building. The portable lifting device includes a catch, a bob, a securing means for attaching the catch to a load and a tether. The catch includes a top panel having at least on elongated slot an entry hole. The bob has a weighted body, a shank, and a tether anchor connected to the shank. The bob enters the catch through the entry hole wherein one the elongated slot receives the shank. When vertical tension is applied to the tether, the weighted body contacts the bottom surface of the top panel allowing the user to raise or lower the catch and attached load.