We also put locks on power switches so no one could activate a screw-like auger on the bottom of the bin.
From the npr.org
An auger in a snow blower or grain elevator is essentially an Archimedes screw.
From the en.wikipedia.org
Screw-propelled vehicles are propelled by auger-like cylinders fitted with helical flanges.
From the en.wikipedia.org
The fillers have a hopper shaped like a cone that holds the mix and puts it in a pouch using an auger screw that is controlled by the agitator.
From the en.wikipedia.org
It is this infinite helical symmetry that gives rise to the curious illusion of movement along the length of an auger or screw bit that is being rotated.