A concave assembly for an agricultural combine harvester comprises a concave, a cover, and a cover actuator. The concave comprises a grate. The cover has an opened position uncovering at least a portion of the grate to allow crop flow through the at least the portion of the grate and a closed position covering the at least the portion of the grate to block crop flow through the at least the portion of the grate. The cover actuator comprises a four-bar linkage and moves the cover between the opened position and the closed position.

A concave assembly for an agricultural combine harvester comprises a concave, a cover, and a cover actuator. The concave comprises a grate. The cover has an opened position uncovering at least a portion of the grate to allow crop flow through the at least the portion of the grate and a closed position covering the at least the portion of the grate to block crop flow through the at least the portion of the grate. The cover actuator comprises a four-bar linkage and moves the cover between the opened position and the closed position.

A latch assembly includes a carriage bolt including a threaded shaft having an enlarged head at one end with a non-circular shoulder adjacent the enlarged head. Each latch assembly further includes a thrust washer received about the carriage bolt, a nut threadedly received on the threaded shaft, and a cam lever pivotally attached to the nut. The cam lever pivots about a pivot axis perpendicular to a length of the threaded shaft, the cam lever including a cam surface configured to engage the thrust washer, the cam lever being pivotable from an unlatched position to a latched position such that engagement of the cam surface with the thrust washer during pivotal motion of the cam lever biases the thrust washer toward the enlarged head to thereby latch a mounting flange of a concave grate to a support flange of a support frame.

A latch assembly includes a carriage bolt including a threaded shaft having an enlarged head at one end with a non-circular shoulder adjacent the enlarged head. Each latch assembly further includes a thrust washer received about the carriage bolt, a nut threadedly received on the threaded shaft, and a cam lever pivotally attached to the nut. The cam lever pivots about a pivot axis perpendicular to a length of the threaded shaft, the cam lever including a cam surface configured to engage the thrust washer, the cam lever being pivotable from an unlatched position to a latched position such that engagement of the cam surface with the thrust washer during pivotal motion of the cam lever biases the thrust washer toward the enlarged head to thereby latch a mounting flange of a concave grate to a support flange of a support frame.

A threshing system for a combine harvester has first to fourth drums, with a concave beneath the first drum and first and second grates for the second and third drums. The second grate has an engaged position beneath the third drum, and it can be driven from the engaged position, around the third drum, to a disengaged position over the third drum. During this disengagement, a space adjustment system moves the fourth drum to increase a space between the third and fourth drums to enable the second grate to pass through the space.

A threshing system for a combine harvester has first to fourth drums, with a concave beneath the first drum and first and second grates for the second and third drums. The second grate has an engaged position beneath the third drum, and it can be driven from the engaged position, around the third drum, to a disengaged position over the third drum. During this disengagement, a space adjustment system moves the fourth drum to increase a space between the third and fourth drums to enable the second grate to pass through the space.

A threshing concave for a combine harvester comprises a crop processing device which is arranged at the inlet to the threshing concave and can be adjusted between an active and an inactive position, adjustable elements which are arranged downstream of the inlet to the threshing concave and can be adjusted between an active and an inactive position, and an adjustment mechanism for separate adjustment of the crop processing device and the adjustable elements, which comprises a movable adjustment element which is coupled to the crop processing device and to the adjustable elements.

A threshing concave for a combine harvester comprises a crop processing device which is arranged at the inlet to the threshing concave and can be adjusted between an active and an inactive position, adjustable elements which are arranged downstream of the inlet to the threshing concave and can be adjusted between an active and an inactive position, and an adjustment mechanism for separate adjustment of the crop processing device and the adjustable elements, which comprises a movable adjustment element which is coupled to the crop processing device and to the adjustable elements.

A threshing concave frame assembly for crop separating operations in a combine harvester is disclosed. In one exemplary embodiment, the concave frame includes a first side member and a second side member opposing each other, wherein the first and second side members each have an interior surface and exterior surface. In addition, a crop threshing bar member is disposed between the interior surface of the first side and second side members of the concave frame. In particular, the crop threshing bar member includes a first end and a second end, wherein the first and second ends are secured to the interior surface of the first and second side members of the concave frame.

A threshing concave frame assembly for crop separating operations in a combine harvester is disclosed. In one exemplary embodiment, the concave frame includes a first side member and a second side member opposing each other, wherein the first and second side members each have an interior surface and exterior surface. In addition, a crop threshing bar member is disposed between the interior surface of the first side and second side members of the concave frame. In particular, the crop threshing bar member includes a first end and a second end, wherein the first and second ends are secured to the interior surface of the first and second side members of the concave frame.