Co-Authored with Aron Olson, P.E.
In May, 2014, a plant farm worker was seriously injured when he fell into the hopper of an electrically powered soil mixer. The mixer in question used a rotating steel ribbon powered by a 7-1/2 hp electric motor to mix batches of materials such as sand, mulch, wood shavings, fertilizers and other landscaping materials to create potting soil. At the top of the hopper sidewalls, within 6 inches of the ribbon, was a steel grate. (more…)