Fan motor safety feature for grain drying system

Claim 1

In a crop-drying system including a grain-confining bin having generally imperforate top and side walls, venting means at the top of said bin, and grain-supporting perforate base means adjacent the base of said bin, said imperforate side and top walls and said grain-supporting perforate base defining a grain-drying chamber, an air inlet chamber having an inlet port, impeller means within said inlet chamber for delivering drying air to a zone beneath said grain-supporting perforate base for passage through said drying chamber, drive means for said impeller means disposed in said drying air path, said system including solar energy extracting means for heating said drying air prior to passage through said drying bin, said solar energy extracting means comprising: a. an elongated solar heating chamber having one end in direct communication with said air inlet chamber, and with the opposed remote end in communication with atmosphere, and comprising frame means with generally water-impermeable bottom, side and top walls, said walls being wrapped about said frame means and defining said solar heating chamber; and b. said air inlet chamber having normally closed vent means therein for admission of air from ambience to said inlet chamber upon a clogging condition occurring at said inlet port.