PNEUMATIC DRILL Russian patent published in 2008 - IPC A01C7/04 

FIELD: agricultural engineering, in particular, seed sowing equipment.

SUBSTANCE: drill has seed hopper, air distributing system equipped with compressed air source, pressure stabilizer, seed flow synchronizing device, and communication channel which is communicated with dispensing devices formed as vortex chambers. Each of vortex chambers has nozzle and seeding branch pipe. Each of said seeding branch pipes is made in the form of additional dispensing unit having conical inner cavity and positioned at outlet end of vortex chamber. Conical chamber is pneumatically connected through outlet opening with seed hopper and has two nozzles. One of nozzles is positioned within conical chamber apex and directed toward other nozzle. Other nozzle is positioned at opposite side and faces outlet opening. Seed flow synchronizer is pneumatically connected to nozzles of additional dispensing devices and coupled to drill drive wheel. Synchronizer is equipped with pneumatic flow change-over mechanism.

EFFECT: provision for feeding of single seeds of various farm crops into furrow with predetermined space between seeds to thereby increase farm crop yield, and reduced consumption of seeds during sowing procedure.

5 dwg