Combine with three-stage separation

Claim 2

A crop threshing and separating assembly having three stages of grain separation including a first separation stage which includes a rotatable cylinder and an open grate concave acting in combination for threshing grain from the heads of crop material and for separating substantial part of the grain from the straw, a second separation stage including raddle means to convey the straw from the cylinder and concave, a third separation stage including means to periodically toss the straw up and to the rear to separate any remaining grain and to convey the straw from the machine, cleaning means for cleaning the grain separated from the straw, and means for collecting all the grain separated from the straw including conveyor means mounted under the concave and said raddle to receive the grain separated from the straw by at least the cylinder and concave and to convey the grain to said cleaning means.

Claim 3

The threshing and separating assembly of claim 1 wherein said second separation stage includes means to subject the straw to a stream of air.

Claim 4

The threshing and separating assembly of claims 1 or 2 wherein said first stage includes a concave extension grate on the rear end of the concave which allows additional grain to separate from the straw.

Claim 5

The threshing assembly of claim 2 wherein the means to subject the straw to a stream of air is a fanning mill mounted under the raddle means with a nozzle having an opening adjacent to the rear of said raddle means that directs a stream of air up and to the rear.

Claim 6

The threshing and separating assembly of claims 1 or 2 wherein said means for cleaning the separated grain includes a shaker shoe, with a plurality of screens, that shakes back and forth and a fanning mill which blows air up and to the rear through the screens.

Claim 7

The threshing and separating assembly of claim 1 wherein said means to periodically toss the straw up and to the rear includes straw walkers.

Claim 8

The threshing and separating assembly of claim 6 wherein said means for collecting the grain separated from the straw includes a grain pan mounted under straw walkers and the rear of said raddle means for receiving grain from said raddle means and said straw walkers and for conveying grain forward to the cleaning means, and conveyor means mounted under the open grate concave for conveying grain toward the rear to the cleaning means.

Claim 9

The crop harvesting and threshing machine of claims 1 or 2 wherein the means for collecting the grain separated from the straw in the first separation stage includes a plurality of augers under the open grate concave.

Claim 10

A crop threshing and separating assembly having three stages of grain separation including a first separation stage which includes a rotatable cylinder and an open grate concave and concave extension acting in combination for threshing grain from the heads of crop material and for separating a substantial part of the grain from the straw, a second separation stage including raddle means extending toward the rear of the separating assembly and up from a point adjacent to the rear portion of the concave extension to convey the straw from the cylinder, concave and concave extension and a nozzle To direct a stream of air up and to the rear through the straw leaving the rear of the raddle, a third separation stage including straw walkers for receiving straw from the raddle to periodically toss the straw up and to the rear to separate any remaining grain and to convey the straw from the machine, a shaker shoe with a plurality of screens that shake back and forth and a fan which blows air up and to the rear through the screens for cleaning the grain separated from the straw in the three separate stages for grain separation, conveyor means mounted under the concave and concave extension and the raddle to receive the grain separated from the straw by at least the cylinder, concave and concave extension and to convey the grain to the shaker shoe for cleaning, and conveyor means for collecting all the grain separated from the straw in at least the third separation stage to convey the grain to the shaker shoe for cleaning.

Claim 11

A crop threshing and separating assembly having three stages of grain separation including a first separation stage which includes a rotatable cylinder and an open grate concave and concave extension acting in combination for threshing grain from the heads of crop material and for separating a substantial part of the grain from the straw, a second separation stage including raddle means extending toward the rear of the separating assembly and up from a point adjacent to the rear portion of the concave extension to convey the straw from the cylinder, concave and concave extension and a nozzle To direct a stream of air up and to the rear through the straw leaving the rear of the raddle, a third separation stage including straw walkers for receiving straw from the raddle to periodically toss the straw up and to the rear to separate any remaining grain and to convey the straw from the machine, a shaker shoe with a plurality of screens that shake back and forth and a fan which blows air up and to the rear through the screens for cleaning the grain separated from the straw in the three separate stages for grain separation, conveyor means mounted under the concave and concave extension and the raddle to receive the grain separated from the straw by at least the cylinder, concave and concave extension and to convey the grain to the shaker shoe for cleaning, and conveyor means for collecting all the grain separated from the straw in at least the third separation stage to convey the grain to the shaker shoe for cleaning.