Patent ID: 8608534
Filing Date: 2013-12-17
Classification: A01F

Abstract:
1. A combine harvester having a threshing mechanism for threshing grain and cleaning apparatus for removing chaff from the threshed grain, wherein the threshing mechanism comprises a rotor and a plurality of concaves and the cleaning apparatus comprises and upper chaffer and a lower sieve and a blower situated in a blower housing providing cleaning air to the threshing mechanism and cleaning apparatus, wherein the improvement comprises: the blower housing having a first cut off plate separating high-velocity air coming from the blower and directing a first portion of said high-velocity air to a lower duct that provides lower airstream to the upper chaffer and lower sieve, and said blower housing having a second cut off plate directing a second portion of said high-velocity air to an inlet of an upper duct that provides an upper airstream directed under the concaves, the second cut off plate extending downward between opposing side walls of the blower housing such that the inlet of the upper duct is formed by a rear wall of the blower housing, the opposing side walls of the blower housing and the second cut off plate, wherein a leading portion of said second cut off plate curves back toward a face of the second cut off plate to form a rolled edge along the width of said upper duct between the opposing side walls of the blower housing.