Conical Vacuum Cleaner Agitator to Reduce Debris Wrapping
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Solution Overview
Problem
Vacuum cleaner agitators often fail due to debris like hair or threads wrapping around them, leading to increased torque and reduced pick-up performance, as existing designs with multiple agitators are prone to entanglement and complex construction.
Innovation Solution
A cleaner head with a single conical agitator mounted transversely within a housing, where debris wraps along the length and falls off, combined with flexible bristles that change configuration to prevent entanglement, and a debris collection channel for easy removal, simplifying construction and improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single agitator is used instead of multiple agitators, then device complexity is reduced and manufacturing cost decreases, but debris entanglement and wrapping around the agitator increases leading to higher torque and potential failure
Solution Approach 1:
The single agitator is divided into multiple functional zones along its length: a leading section with first bristles for initial debris engagement, a middle section with second bristles for continued agitation, and a trailing section with third bristles for final debris removal. This segmentation allows debris to be progressively managed along the agitator length, preventing accumulation and wrapping while maintaining a single agitator structure.
Solution Approach 2:
Multiple sets of bristles positioned at different locations and angles along the agitator act as intermediaries between the rotating agitator and the debris. The first bristles engage debris initially, the second bristles continue agitation, and the third bristles prevent wrapping by directing debris away from the agitator surface, thus mediating the interaction to prevent harmful wrapping.
2Productivity
If bristles are positioned to effectively agitate debris, then pick-up performance improves, but debris becomes more prone to wrapping around the agitator, increasing torque and reducing reliability
Solution Approach 1:
Different sections of the agitator have bristles with different properties and orientations tailored to their specific functions. The first bristles are positioned and angled for initial debris engagement and agitation, the second bristles are configured for continued agitation in the middle section, and the third bristles are positioned and angled specifically to prevent wrapping at the trailing section. This local differentiation optimizes both pick-up performance and anti-wrapping capability.
Solution Approach 2:
Instead of having all bristles point in the direction of rotation to maximize agitation, the third bristles at the trailing section are positioned and angled to oppose the wrapping tendency. They are configured to push debris away from the agitator surface rather than allowing it to wrap, inverting the typical bristle function to specifically address the wrapping problem while maintaining overall agitation effectiveness.
3Ease of repair
If the agitator is mounted to allow easy debris removal, then maintenance becomes simpler, but the structural complexity of the mounting mechanism increases
Solution Approach 1:
The agitator is designed as a cantilevered structure that can be independently extracted from the cleaner head housing. The mounting mechanism allows the agitator to be removed as a single unit for easy debris clearance, separating the agitator assembly from the main housing structure. This extraction capability enables simple maintenance without requiring disassembly of the entire cleaner head.
Solution Approach 2:
The cantilevered mounting design allows the agitator to be easily removed and reinstalled by the user for routine debris removal. The self-service nature of this mounting system enables users to perform maintenance themselves without requiring specialized tools or complex disassembly procedures, simply by accessing the removable agitator assembly.
Data Source
AI summary
A cleaner head for a vacuum cleaner includes a single agitator rotatably mounted within a housing, the agitator being arranged transversely within the housing such that it is perpendicular to the direction of travel of the cleaner head during use, the agitator being conical in shape, such that a first end has a larger diameter than a second end.