Concave guide for a combine harvester

Details Concave guide for a combine harvester Concave guide for a combine harvester

1990-11-23

1991-10-15

Bui, Thuy M.

Crop threshing or separating

Concave

Grid or grate

A01F 1200

Patent

active

050570560

ABSTRACT:
A threshing concave or concave guide for a combine harvester is described. The concave is positioned in its conventional location on a combine, however, the design has been modified. The crop is directed into the concave by threshing cylinder rasp bars. As the crop enters the guide, at its base, there are positioned a number of angled bars that direct the incoming crop away from the center of the concave. Traditional concaves move the grain toward the center of the device. The angled bars of the present invention distribute the load more evenly along the concave surface, thereby resulting in a decreased wear and tear of the concave and rasp bars. The design also reduces the damage to separate grain as the grain slides into the leading edge of the device rather than abruptly hitting the sharp edge of a first cross bar, as in traditional concaves.

REFERENCES:
patent: 923324 (1909-06-01), Brost
patent: 1643683 (1927-09-01), Shorb
patent: 2303200 (1942-11-01), Dray
patent: 3034513 (1962-05-01), Ausherman
patent: 3256887 (1966-06-01), Ausherman
patent: 3512533 (1970-05-01), Loewen
patent: 4004404 (1977-01-01), Rowland-Hill et al.
patent: 4909772 (1990-03-01), Kuchar

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