Abstract: The invention comprises an inverted frusto-conical shaped perforated floor which is mounted in a conventional grain drying bin in a raised position relative to the base floor thereof. The perforated floor has a plurality of grain discharge openings formed therein, each of which are selectively closed by a trough-like valve. The valves have varying lengths to obtain better grain distribution on the base floor. The valves are controlled by a manually operated means. A tube tensioner is provided on the bottom surface of the perforated floor to stiffen and strengthen the perforated floor. A series of bands are mounted above the perforated floor to maintain the level of the grain being dried substantially parallel to the upper surface of the perforated floor for evenness of drying. The grain is dumped on the perforated floor and the dried air is passed upwardly through the perforated floor to dry the grain.

Abstract: A hydraulic torque convertor is disclosed which is particularly well-adapted for use with an apparatus for drying grain. The apparatus for drying grain comprises a conical shaped perforated floor which is mounted in a conventional grain drying bin in a raised position relative to the base floor thereof. The perforated floor has a plurality of grain discharge openings formed adjacent the outer ends thereof, each of which are selectively closed by a trap door valve means. An electric motor is operatively connected to the hydraulic torque convertor which is operatively connected to the valve means for moving the valve means between open and closed positions responsive to the temperature of the grain positioned on the floor. The hydraulic torque convertor comprises a disc shaped rotor which is connected to the output shaft of the electric motor. A housing rotatably embraces the end of the output shaft and the rotor and is operatively connected to a horizontally disposed shaft extending therefrom.