US Patent 10582657 Spreading device

A spreading device includes a containing unit to contain a spread material, a first spreading unit including a first rotating body to spread the spread material contained in the containing unit, a second spreading unit including a second rotating body to spread the spread material contained in the containing unit, a first driving source of which speed is changeable, a first shaft to transmit power provided from the first driving source, a second shaft to transmit power provided from a second driving source different from the first driving source, and a power transmission mechanism to receive power from the first shaft and power from the second shaft, the power transmission mechanism being capable of transmitting the power received from the first shaft and the power received from the second shaft to the first rotating body and the second rotating body.