SPOOL MULTISTART SCREW SEEDING UNIT Russian patent published in 2012 - IPC A01C7/12 

FIELD: agriculture.

SUBSTANCE: seeding unit includes a body, a coil, a collar, a socket coupler and a valve. The coil is adapted to change. On the cylindrical surface of coil there are multistart inclined screw auger blades, forming curved grooves. The volume of the grooves is made multiple to the size of seed material. The surface of the curved bottom of the valve facing the coil is made along the curved tractrix and is located at an acute angle to the horizontal. The end of the valve for discarding of the material from it is placed vertically on the value of 0.40…0.50 D_K from the center of rotation of the coil, where D_K is the diameter of the coil.

EFFECT: use of the invention enables to carry out quality seeding of grain crops with a uniform distribution of seeds over the area of nutrition and with the reduction of injury, as well as local fertiliser application.

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