Swing Set Pump
We can never exhaust the resource of fun. We designed a pump with this concept, resulting in a swing

Solution

First, we recycled an old swingset into a slimmer version. Then, we added another rung for our makeshift crossbeam. Over the cross beam is our pvc pipe mechanism. Perpendicular to the the pvc pipe are  two pieces of parallel 2,4".  These pieces of wood are attached to a swingset. As  shown in the video below, when the swing pendulates back and forth, it rotates the pvc pipe. At the other end of the pvc pipe, we attached another piece of wood as our lever. The lever has a drill through it which is attached to the handle on the pump. This drill allows for the handle to rotate with the rotation of the pvc pipe, producing a much more efficient ratio of swing to pumps.


http://www.youtube.com/watch?v=clNBNMMre7g&feature=share&list=UUAJac8GsuvkZ1C7KyZeYTzA