PNEUMATIC DRILL Russian patent published in 1998 - IPC

FIELD: agricultural engineering, in particular, bulk material sowing equipment. SUBSTANCE: pneumatic drill has bulk material feeding device with three funnels provided with retainer for adjusting their position in vertical plane. Lower funnel has opening whose diameter is equal to inner diameter of truncated confuser or equal to outer diameter of confuser for direct mounting of funnel on confuser. Diameter of middle funnel is equal to inner small diameter of confuser plus 1/3 of difference between inner small diameters of diffuser and confuser. Diameter of upper funnel is equal to inner small diameter of confuser plus 2/3 of difference between inner small diameters of diffuser and confuser. When three kinds of fertilizers are to be sown, funnels are arranged in spaced relation one above another, with space being equal to 1/3 of distance between diffuser and confuser. When two kinds of fertilizers are to be sown, middle funnel may be arranged on lower funnel and upper funnel may be arranged in the middle position. When fertilizer of one kind is to be sown, upper and middle funnels may be laid onto lower funnel. EFFECT: increased efficiency, simplified construction and enhanced reliability in operation. 3 cl, 4 dwg