Abstract: An improved threshing cylinder for a combine has an enclosed cylinder construction and rasp-type cylinder bars secured to mounting flanges on an outer periphery of the enclosed cylinder. The enclosed cylinder is substantially impervious to crop material so that debris cannot accumulate inside the cylinder during operation. The rasp-type cylinder bars are center-arched, deep-toothed, and have leading edges that slope rearwardly relative to a direction of rotation less than about 15 degrees from a radial line passing through the axis of rotation. The teeth on the rasp-type bars have a substantially constant height from a leading edge to a trailing edge of the bars. The mounting flanges each have a sloped front surface for guiding crop material outwardly to the rasp-type bars, and a mounting surface having a plurality of bores for attaching the rasp-type bars.

Abstract: An improved threshing cylinder for a combine has an enclosed cylinder construction and rasp-type cylinder bars secured to mounting flanges on an outer periphery of the enclosed cylinder. The enclosed cylinder is substantially impervious to crop material so that debris cannot accumulate inside the cylinder during operation. The rasp-type cylinder bars are center-arched, deep-toothed, and have leading edges that slope rearwardly relative to a direction of rotation less than about 15 degrees from a radial line passing through the axis of rotation. The teeth on the rasp-type bars have a substantially constant height from a leading edge to a trailing edge of the bars. The mounting flanges each have a sloped front surface for guiding crop material outwardly to the rasp-type bars, and a mounting surface having a plurality of bores for attaching the rasp-type bars.

Abstract: A combination of cylinder bars used with a backing plate for mounting on different lengths of threshing cylinders. The cylinders used with different models of combines for the threshing of grain, chaff and straw. The combination of cylinder bars includes a forward cylinder bar, a reverse cylinder bar and a center cylinder bar. The center cylinder bar is characterized by having both a forward and a reverse tooth configuration. Also, the center cylinder bar may be of various lengths depending on the length of the cylinder. Opposite side portions of the backing plate are bent to match the threshing cylinder radius. The backing plate includes bolt holes to match bolt holes on cylinder flanges on the threshing cylinder. Bolts are used to secure the backing plate to the cylinder. The three cylinder bars are mounted on a top portion of the backing plate. The top portion of the backing plate includes bolt holes to match the configuration of the bolt holes in the forward, reverse and center cylinder bar.