LIPPED SCREEN Russian patent published in 2017 - IPC A01F12/44 

FIELD: agriculture.

SUBSTANCE: lipped screen contains the swing doors installed in the frame, made with a flat comb along the upper edge and with through grooves 8 at the bottom edge. Between the ridges 6 of the comb grooved teeth 7 are placed. Teeth 7 are curved from the plane of the comb downwards by convexity towards the air flow. The through grooves 8 of the bottom edge of the comb are located opposite said teeth 7. On the surface of the swing door, indentations 9 directed from the pivot axis to the corresponding tooth 7 are formed, smoothly passing into the trough 10 of this tooth 7.

EFFECT: increasing the operating efficiency of device.

10 cl, 9 dwg