Most people are probably familiar with Leonardo hammer cams. But I'd like to make a motor-powered hammer that swings more like this (apologies for the crude diagram):
The hammer would fall due to gravity, then get dragged along the ground on its way back up.
Of course, this diagram does not work, because the hammer on the way up needs to make a >= 90 degree angle with the wheel radius in order to fall (step 2), but needs to collapse to < 90 degrees in step 4 in order to drag along the ground.
Is this doable with simple, hardware store components?