PNEUMATIC FEED Russian patent published in 2004 - IPC

FIELD: agricultural engineering; precision seeding machine. SUBSTANCE: proposed pneumatic feed contains hopper, housing, intake device, seed and pressure boxes. Housing accommodates vertical feed disk with metering elements. Bases of adjacent metering elements arranged from side of seed box are mated. Metering elements are provided with suction holes and are made in form of cissoid of revolution. Space of pressure box communicates with excess pressure channel. Intake device is located in upper part of housing. It contains tube and roller closing hole in metering element when seeds are dropped into seed conductor. EFFECT: improved precision of seeding at increased speed of rotation of feed disk.