Agitator Brush Bar Coupling for Secure Alignment and Removal
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Solution Overview
Problem
Existing agitator assemblies in surface treatment apparatuses, such as carpet-washing machines, face challenges in securely attaching and rotating the agitator brush bar, leading to inefficiencies in cleaning and maintenance, particularly in ensuring proper engagement and preventing unnecessary rotational movement.
Innovation Solution
The agitator assembly features a body with alignment and securing formations that allow for axial movement to engage and rotate the agitator with a drive member, utilizing threaded or ridged configurations to prevent further rotation once secured, and a user-graspable member for easy insertion and removal, ensuring secure attachment and simplified maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the agitator is securely attached to the drive member, then rotational stability is improved, but the complexity of the attachment mechanism increases
Solution Approach 1:
The attachment mechanism is divided into separate functional elements: alignment formations (protrusions and recesses) for positioning, and securing formations (threaded or splined portions) for rotational engagement. This segmentation allows each element to perform its specific function effectively while keeping the overall design manageable.
Solution Approach 2:
The alignment formations engage first during insertion to pre-position the agitator and drive member correctly before the securing formations engage. This preliminary alignment action ensures proper orientation is established before rotational securing occurs, preventing misalignment issues.
2Reliability
If the agitator requires proper alignment during attachment, then rotational stability is improved, but the ease of operation decreases
Solution Approach 1:
The alignment formations (protrusions and recesses) automatically engage first when the agitator is inserted axially, pre-positioning the components correctly before the user needs to apply torque for full engagement. This preliminary alignment action occurs passively during insertion, requiring no additional user effort.
Solution Approach 2:
The attachment process is segmented into distinct phases: initial axial insertion with alignment formation engagement, followed by rotational engagement of securing formations. This segmentation allows the alignment function to be separated from the securing function, making each step simpler and more intuitive.
3Ease of repair
If the agitator allows for easy removal and reinstallation, then maintenance ease is improved, but the reliability of secure attachment may worsen
Solution Approach 1:
The attachment mechanism uses distinct alignment formations and securing formations that can be engaged and disengaged in a simple sequence. This segmentation allows the agitator to be easily removed and reinstalled while maintaining secure attachment through the same formations, as each formation type performs its specific function reliably.
Solution Approach 2:
Upon reinstallation, the alignment formations automatically re-engage first to restore proper positioning before the securing formations are fully engaged. This preliminary action ensures that even after removal and reinstallation, the reliable alignment is restored before final securing occurs.
Data Source
AI summary
An agitator assembly for a cleaning apparatus including an agitator having a body with first and second ends, and a first alignment formation and a first securing formation at or adjacent the first end; and a drive member operable to impart rotation about a drive axis, and a second alignment formation adapted to cooperate with the first alignment formation, and a second securing formation adapted to engage the first securing formation. Relative axial movement of the agitator in a first direction towards the drive member causes contact between the first and second alignment formations. Further relative axial movement of the agitator in the first direction causes relative rotation between the agitator and drive member and yet further relative axial movement of the agitator in the first direction causes engagement between the first and second securing formations, substantially to prevent further relative rotational movement between the agitator and drive member.