Straw chopper mounting for a combine
Patent 4669489 Issued on June 2, 1987. Estimated Expiration Date: 
December 2, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 2, 2005. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2213906 2862536 3587690 3712309 Straw spreader Axial-flow thresher-separator unit for combine harvesters Straw chopper and spreader assembly Chaff spreading apparatus Patent #: 4617942 InventorsAssigneeApplicationNo. 06/803370 filed on 12/02/1985US Classes:460/112, With chopper241/186.3Including means to alter direction of flowExaminersPrimary: Hirsch, Paul J.International ClassA01F 12/40 (20060101)AbstractThe rear mounted straw chopper of a combine harvester receives the straw discharge from the straw walkers of the combine and discharges chopped straw rearwardly. The chopper is slidably supported on a pair of spaced apart, longitudinally oriented guide rails so that the chopper can be adjusted from a rearward, operating position to a forward, inoperative or windrow position in which straw bypasses the chopper. Movement of the chopper on its guide rails is facilitated by attachment to the straw chopper casing of a transverse shaft and sprocket assembly, the teeth of a pair of sprockets engaging longitudinally spaced openings in the guide rails so that, upon rotation of the shaft, the sprockets and guide rails cooperate in rack and pinion fashion to propel the chopper assembly along the rails while maintaining it in square alignment. The shaft and sprocket assembly may be rotated conveniently by means of a wrench engaging flats on an end of the shaft.Other References
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