A cover for a threshing concave or separator grate of a crop threshing assembly may include a first body portion. The first body portion may include a leading end, a trailing end opposite the leading end, a first lateral side, and a second lateral side opposite the first lateral side. A first passage may be formed through the leading edge, and the passage may define a first axis that extends laterally between the first lateral side and the second lateral side. A notch may be formed in the first body portion and extend from the trailing edge end towards the leading end.

A cover for a threshing concave or separator grate of a crop threshing assembly may include a first body portion. The first body portion may include a leading end, a trailing end opposite the leading end, a first lateral side, and a second lateral side opposite the first lateral side. A first passage may be formed through the leading edge, and the passage may define a first axis that extends laterally between the first lateral side and the second lateral side. A notch may be formed in the first body portion and extend from the trailing edge end towards the leading end.

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 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 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 release unit is used for releasing the concave of the threshing system of a combine harvester, to allow large objects to be released from the space between the threshing rotor and concave. In one aspect, a particular design of the release unit is provided. In other aspects, sensing and actuation functions are provided associated with the concave release function.