Reciprocating Sieve Hanger Mount for Agricultural Harvester

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Solution Overview

Problem

Agricultural harvester reciprocating sieve assemblies face challenges with weight and durability due to cyclical loading, leading to fastener loosening and weld fatigue, necessitating a lighter and more resilient design.

Innovation Solution

The implementation of a sieve assembly with a frame configuration using elongate extruded members and hanger mounts that distribute loads more evenly, featuring tubular fasteners and apertures for secure attachment, reducing the weight and enhancing resistance to cyclical stresses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the reciprocating sieve assembly uses traditional fasteners and welds to connect frame members, then the assembly can be assembled and maintained, but the fasteners loosen and welds fail due to metal fatigue from cyclical loading

Engineering Contradiction:
ImprovedurabilityVSAvoidresistance to cyclical stresses
Core Design Contradiction:
ReliabilityVSStrength

Solution Approach 1:

The patent changes the connection method from mechanical fasteners and welds to friction grip connections using pressed wood blocks. This fundamental parameter change in the connection mechanism eliminates the fastening elements that were failing under cyclical loading, providing both reliability and strength without the previous failure modes.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent replaces the mechanical fastening system (bolts, screws, welds) with a friction-based mechanical system using pressed wood blocks. This substitution eliminates the need for fasteners that loosen and welds that fatigue, while maintaining the structural integrity of the frame under cyclical reciprocating loads.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

2Stability of the object's composition

If the reciprocating sieve assembly uses welded construction to prevent fastener loosening, then connection stability improves, but the welds become prone to metal fatigue failure

Engineering Contradiction:
Improveconnection stabilityVSAvoidweld durability
Core Design Contradiction:
Stability of the object's compositionVSReliability

Solution Approach 1:

The patent changes the connection methodology from welding to friction grip pressing with wood blocks. This parameter change maintains connection stability through friction and mechanical interlocking while completely avoiding the metal fatigue problem inherent in welded joints under cyclical loading.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The patent substitutes the welding process with a mechanical pressing system using friction grip wood blocks. This replacement provides stable connections through friction and geometric interlocking without creating the stress concentration and metal fatigue issues that plague welded connections in reciprocating applications.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Strength

If the sieve assembly uses solid frame members for strength, then structural integrity improves, but the overall weight of the assembly increases

Engineering Contradiction:
Improvestructural integrityVSAvoidsieve assembly weight
Core Design Contradiction:
StrengthVSWeight of moving object

Solution Approach 1:

The patent uses composite construction combining wood blocks with metal frame members. The pressed wood blocks provide structural support and connection functionality while being lighter than solid metal equivalents, achieving the desired strength with reduced overall weight.

Inventive Principle:
Principle #40Composite materials

Solution Approach 2:

The patent applies different materials locally - using pressed wood blocks specifically at connection points where strength is needed, rather than constructing the entire frame from heavy solid metal. This localized application of materials achieves structural integrity while minimizing overall weight.

Inventive Principle:
Principle #3Local quality

Data Source

PatentEP2850938B1Hanger mount for a reciprocating sieve
Publication Date: 2017.04.19 DEERE & CO
  • EP2850938B1 patent drawingFigure 1
  • EP2850938B1 patent drawingFigure 2
  • EP2850938B1 patent drawingFigure 3

AI summary

A hanger mount (206, 208, 210, 212) is provided for a reciprocating sieve assembly (106, 108) having a left side longitudinal member (300, 308), a right side longitudinal member (302, 310), a forward transverse member (304, 312), and a rearward transverse member (306, 314), wherein the hanger mount is a unitary body that has and defines a hanger connection (1000, 1100, 1200, 1300) that is configured to be coupled to a reciprocating hanger (110, 112); a first mounting surface (1006, 1010, 1106, 1110, 1206, 1210, 1306, 1310) that is configured to be fixed to one of the longitudinal members (300, 308, 302, 310); and a second mounting surface (1025, 1125, 1225, 1325) that is configured to be fixed to one of the transverse members (304, 312, 306, 314).