Adjustable Grain Screen With Manual Aperture Control

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Solution Overview

Problem

Existing grain cleaning systems for harvesters require complex electro-mechanical solutions and modifications to adjust screens for different grain types and sizes, leading to high production and maintenance costs.

Innovation Solution

A screen with universal scales featuring concave teeth and an adjustable mechanism that allows for simple mechanical adjustment, enabling the screen to handle various grain types and sizes without the need for electro-mechanical systems, ensuring precise aperture control and lower maintenance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If electro-mechanical systems and sensors are used to adjust screen height for different grain types, then adaptability to various grain types is improved, but device complexity and maintenance costs increase

Engineering Contradiction:

Improveadaptability to various grain typesVSAvoiddevice complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent removes electro-mechanical systems, sensors, and automated control mechanisms from the screen adjustment system. The invention uses a simple manual adjustment mechanism where the operator directly changes screen height according to grain type, eliminating complex electro-mechanical components while maintaining adaptability.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements a self-service approach by providing pre-configured screen height settings for different grain types that operators can manually select and adjust without requiring complex automated systems. The screen structure includes built-in adjustment mechanisms that operators can easily manipulate based on their knowledge of grain characteristics.

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If electro-mechanical systems with motors and spindles are used to control scale aperture, then cleaning precision for different grain sizes is improved, but manufacturing cost and maintenance cost increase

Engineering Contradiction:

Improvecleaning precisionVSAvoidmanufacturing cost

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent employs simple, inexpensive mechanical components such as manual cranks, levers, and adjustable screens that can be easily manufactured and replaced. These basic mechanical elements provide sufficient cleaning precision without the need for expensive motors and electronic controls, reducing both manufacturing and maintenance costs.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent replaces complex electro-mechanical systems with simpler mechanical adjustments. Instead of using motors and spindles to control scale aperture, the invention uses manual mechanical mechanisms that allow operators to directly adjust the screen position and aperture size according to grain type, reducing system complexity and cost.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If complex electro-mechanical adjustment mechanisms are installed in the harvester, then adaptability to different grain types is improved, but the harvester requires complex modifications and maintenance

Engineering Contradiction:

Improveadaptability to different grain typesVSAvoidmaintenance cost

Core Design Contradiction:

Adaptability or versatilityVSEase of repair

Solution Approach 1:

The patent divides the screen adjustment system into independent, modular components that can be separately adjusted and maintained. Each screen assembly can be independently modified for different grain types without affecting other parts of the harvester, making maintenance and repairs simpler and more cost-effective.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent implements dynamic adjustability through simple mechanical means that allow the screen height and aperture to be changed during operation or between crops. The adjustment mechanisms are designed to be easily modified without requiring complex electro-mechanical systems, reducing maintenance requirements while maintaining versatility.

Inventive Principle:

Principle #15Dynamics

Data Source

PatentUS12453313B2Adjustable grain screen and methods for using the same

Publication Date: 2025.10.28 MARTA LINDENMAYR DOWICH

AI summary

Adjustable screen comprising scales (1) consisting of teeth (1.1) interspersed with bases (1.2), an inclined tab (1.3) on the rear portion and a channel (1.4) between the inclined tab (1.3) and teeth (1.1) for the introduction of the shafts (3.1) for moving the scales, the teeth (1.1) being fluted and the bases (1.2) being flat. It also comprises partitions (2.1) fastened at the ends (2.2) between the sides (2.3) of the structure of the screen (2) and a mechanism for adjusting the scales (3) made up of shafts (3.1) rotating in orifices (2.6) of the sides (2.3) of the structure of the screen (2). After the orifices (2.6), the shafts (3.1) have an S-shaped bend (3.2) for introduction into the orifices (3.4) of the ruler (3.3) in the outer face of the side of the screen (2.3). The end (2.2) has an orifice (2.7) on which a spindle (3.5) with a rotating lever (3.6) is mounted. An elastic part (3.8) flanked by protective elements (3.7) is mounted on the spindle (3.5).