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.

A concave extends circumferentially about a portion of a rotor of a rotary processing unit of an agricultural combine. The concave has threshing beds forming openings therebetween for grain to pass through from a path of crop material between the concave and the rotor. The path of crop material has a flow direction relative to the concave in response to rotation of the rotor in a threshing direction. Each threshing bed includes a first extremity defining a threshing edge, a second extremity, and a separating grate extending across one of the openings between the first extremity and the second extremity, the first extremity overlapping the second extremity of an adjacent one of the threshing beds, locating the threshing edge in the path of crop material facing opposite to the flow direction. Each threshing bed extends from its threshing edge to its second extremity in the flow direction.

A concave system for a combine harvester, including a concave configured to be placed within the combine harvester around a rotor positioned within the combine harvester, a cover plate or MOG limiter; and an over-center latch assembly including a base plate, a handle, a lever, and a loop. Further, a kit including one or more concaves, cover plates and/or MOG limiters, one or more over-center latches, one or more linchpins, and one or more wire lock clevis pins.

A concave system for a combine harvester, including a concave configured to be placed within the combine harvester around a rotor positioned within the combine harvester, a cover plate or MOG limiter; and an over-center latch assembly including a base plate, a handle, a lever, and a loop. Further, a kit including one or more concaves, cover plates and/or MOG limiters, one or more over-center latches, one or more linchpins, and one or more wire lock clevis pins.

A concave for an agricultural combine includes threshing beds carried by a base frame and forming openings therebetween for grain to pass through. Each threshing bed includes a first end, a second end, a length from the first end to the second end, an inner extremity, an outer extremity, and a separating grate extending across one of the openings for separating grain from threshed crop material. The separating grate extends along the length between the first end and the second end, is between the inner extremity and the outer extremity and includes grate openings and spaced-apart bars. The bars are between adjacent grate openings and include struts each connecting two adjacent parts of the separating grate between adjacent grate openings and severed bars each including bar segments extending inwardly toward one another to respective free ends on either side of a gap between adjacent grate openings.

A MOG limiting device, herein described as a MOG limiter, approximates a portion of the curvilinear length of a concave. The MOG limiting device can include a connection point near the middle of a concave, slightly offset from center. A bolt, washer and nut assembly protrudes downwardly from the underside of the concave. Two assemblies are positioned in the middle of each side of the concave. The assemblies cooperate with a mounting plate on the MOG limiters to form an upper concave connection and a lower concave connection in each half of the concave. In the cross frame, insert slots are positioned to receive a hinge point located at the end of each arced member making up the frame (rail supports). The hinge points are slidably inserted into the opening and then rotated upwardly to be positioned adjacent to and in conformity with the curvature of the underside of the concave with the connection assemblies holding the MOG limiter in place.

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.

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.

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.

A universal threshing concave for an agricultural combine for harvesting different types of crops is disclosed. The threshing concave comprises a frame with a pair of opposite side members and opposite end members. The invention further comprises an array of threshing bars angled and notched along their longitudinal extent, and hexagonal in cross-section. Each bar is seated in openings in the end members of said frame.