Sieve Support Structure Resisting Deformation in Agricultural Combines

The support structure is divided into multiple discrete components: side rails, cross rails, and tension members. This segmentation allows the structure to achieve strength through the arrangement and connection of multiple elements rather than relying on large reinforcing gussets, thereby preserving the cleaning surface area.

The patent introduces tension members that extend diagonally across the space bounded by the rails, adding a diagonal dimension to the support structure. This creates a three-dimensional framework that provides structural strength without requiring additional area within the planar cleaning surface.

The structure uses multiple lightweight components (rails and tension members) distributed throughout the assembly rather than concentrating mass in large corner gussets. This segmentation achieves structural strength through geometric arrangement and force distribution rather than mass.

The support structure combines rigid rails with tension members to create a composite framework that achieves high strength-to-weight ratio. The tension members provide structural reinforcement without the mass penalty of traditional gusseted connections.

The connection between cross rails and side rails is made pivotal rather than rigidly fixed, allowing the structure to dynamically adapt to uneven loading conditions. This dynamic connection prevents stress concentration and fatigue cracking while maintaining structural integrity during operation.

The patent changes the connection parameter from rigid welded joints to pivotal connections with clearance, allowing small angular movements. This parameter change enables the structure to accommodate loading variations without developing fatigue cracks in the connections.