A combine for harvesting a harvested material that includes a grain, the combine comprising: a threshing chamber comprising a series of threshing and separating apparatuses, sequentially arranged, comprising at least: (i) a straight bar concave (ii) a first round bar concave, and (iii) a second round bar concave. The size of each of the straight bar throats is smaller than a size of the first openings, and the size of each of the first openings is smaller than the size of each of the second openings.

An over-center latch for a concave combine comprises a mount directly attached to a concave combine or an accessory for a concave combine, a base plate, a lever with a loop at one end that is configured to attach to a catch, and a center pin that allows the lever to rotate with respect to a handle. Either the handle or the lever can be pulled into a vertical position.

An over-center latch for a concave combine comprises a mount directly attached to a concave combine or an accessory for a concave combine, a base plate, a lever with a loop at one end that is configured to attach to a catch, and a center pin that allows the lever to rotate with respect to a handle. Either the handle or the lever can be pulled into a vertical position.

A dynamically operated concave threshing bar system, method, and apparatus wherein one or more threshing bars within a concave can dynamically move to various positions in real-time based on one or more conditions such as the type crop being harvested and on a determination by a combine harvester's computerized system, artificial intelligence (AI) system, or upon the operators input, among others. The concave can include a concave frame having a pair of arcuate side members, a threshing bar, and an actuator coupled to the threshing bar, wherein the actuator can be configured to move the threshing bar along the arcuate side members of the concave frame.

A dynamically operated concave threshing bar system, method, and apparatus wherein one or more threshing bars within a concave can dynamically move to various positions in real-time based on one or more conditions such as the type crop being harvested and on a determination by a combine harvester's computerized system, artificial intelligence (AI) system, or upon the operators input, among others. The concave can include a concave frame having a pair of arcuate side members, a threshing bar, and an actuator coupled to the threshing bar, wherein the actuator can be configured to move the threshing bar along the arcuate side members of the concave frame.

A concave apparatus is provided for use in a twin rotor combine harvester which includes replaceable concave inserts which are carried in a concave support frame including two side rails which extend around a portion of each rotor from a bottom of the rotor outwardly around approximately 90 degrees. The frame includes transverse connecting bars at right angles to the side rails with an upper bar, a center bar and a lower bar defining between them openings for the concave inserts. An upper transverse bar of the lower concave insert has fastener holes to receive coupling fasteners for connection to the center transverse bar of the concave support frame and has a projecting portion lying in an axial plane and projecting radially outwardly to a position beyond the center transverse bar of the concave frame with fastener holes therethrough for attachment to pivotal bracket of the combine harvester.

A concave apparatus is provided for use in a twin rotor combine harvester which includes replaceable concave inserts which are carried in a concave support frame including two side rails which extend around a portion of each rotor from a bottom of the rotor outwardly around approximately 90 degrees. The frame includes transverse connecting bars at right angles to the side rails with an upper bar, a center bar and a lower bar defining between them openings for the concave inserts. An upper transverse bar of the lower concave insert has fastener holes to receive coupling fasteners for connection to the center transverse bar of the concave support frame and has a projecting portion lying in an axial plane and projecting radially outwardly to a position beyond the center transverse bar of the concave frame with fastener holes therethrough for attachment to pivotal bracket of the combine harvester.

A concave arrangement for a combine harvester has a frame which supports a set of side-by-side concave sections, each supported by a pair of support arms of the frame. A roller arrangement is provided between each concave section and each of the pair of support arms such that each concave section is slidable around the frame along an arcuate path between installed and retracted positions. The concave sections can be fixed to the frame in their installed positions.

A concave arrangement for a combine harvester has a frame which supports a set of side-by-side concave sections, each supported by a pair of support arms of the frame. A roller arrangement is provided between each concave section and each of the pair of support arms such that each concave section is slidable around the frame along an arcuate path between installed and retracted positions. The concave sections can be fixed to the frame in their installed positions.

A combine harvester comprises a concave, a cover plate or MOG limiter, and an over-center latch assembly that secures the cover plate or MOG limiter to an outer surface of the concave. The over-center latch assembly comprises a base plate including a pair of ears protruding therefrom, a handle in rotational communication with the pair of ears, a lever operatively connected to the base plate via a center pin in rotational communication with the handle that allows the lever to rotate with respect to the handle, and a loop at a distal end of the lever. A wire lock clevis pin is positioned between a center rail of the concave and a rail of the cover plate or MOG limiter. Each of the cover plate or MOG limiter includes hinge points positioned at an end opposite the over-center latch assembly for insertion into a cross bar of the concave.