Compressible Vacuum Rollers for Hair and Debris Entanglement
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Robotic vacuums face challenges in maximizing cleaning effectiveness, preventing hair and debris entanglement, and maintaining performance while minimizing size and production costs, as hair and string-like debris often stall the device and degrade cleaning ability.
Innovation Solution
A compressible, resilient roller with V-shaped chevrons and a four-bar linkage mechanism that allows the cleaning head to adjust vertically, preventing hair and debris from wrapping around the roller and ensuring continuous contact with the cleaning surface, while the linkage facilitates smooth operation over different floor types.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a rigid roller is used for cleaning, then cleaning effectiveness is improved, but hair and debris entanglement increases causing device stalling
Solution Approach 1:
The roller transitions from a rigid structure to a compliant structure that can change its physical state. The compliant roller is capable of deforming and adapting its parameters (shape, density) to accommodate different debris types, allowing it to maintain cleaning effectiveness while preventing entanglement through controlled deformation rather than rigid contact
Solution Approach 2:
The roller is constructed from composite materials including foam core, fabric layers, and elastic elements. This composite structure combines the cleaning effectiveness of dense material with the flexibility of elastic components, enabling the roller to effectively contact and move debris while complying to prevent hair and string entanglement that would stall the device
2Device complexity
If the cleaning head is fixed in position, then structural simplicity is maintained, but cleaning performance on varied floor types deteriorates
Solution Approach 1:
The cleaning head is transformed from a fixed static structure to a dynamic adjustable structure. The four-bar linkage mechanism enables the cleaning head to automatically adjust its vertical position and maintain optimal contact with the floor surface, adapting to different floor types and conditions while preserving relatively simple structural implementation
3Reliability
If the roller is made compliant to prevent entanglement, then reliability is improved, but cleaning effectiveness may deteriorate
Solution Approach 1:
The roller uses composite materials including foam core for compliance, fabric layers for surface contact and debris engagement, and elastic elements for maintaining structural integrity. This composite construction ensures the roller remains compliant enough to prevent entanglement while maintaining sufficient firmness through the combined material properties to effectively clean surfaces
Solution Approach 2:
The roller's physical parameters (density, firmness, shape) are designed to change dynamically during operation. The compliant structure allows parameter changes that enable effective debris contact and movement while preventing entanglement, optimizing both reliability and cleaning effectiveness through adaptive parameter adjustment rather than fixed properties
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the robotic vacuum's ability to handle hair and debris, maintaining airflow and cleaning efficiency by directing debris into the vacuum inlet and preventing entanglement, thus ensuring uninterrupted operation and improved user satisfaction.
Implementation Method 1
The resilient tubular member has integrally formed therein a plurality of resilient curvilinear spokes extending between an inner surface of the flexible tubular member and a hub disposed along the longitudinal axis of the tubular member. The engagement elements enable the transfer of torque from the drive shaft to the resilient tubular member via the resilient curvilinear spokes.
Implementation Method 2
the resilient compressible material may be, for example, Thermoplastic Polyurethane (TPU) foam, Ethyl Vinyl Acetate (EVA), or polypropylene foam, and in some implementations, the resilient compressible material may be affixed permanently to the rigid shaft to resist shear forces that would otherwise dislodge the resilient compressible material.
Data Source
AI summary
An autonomous coverage robot includes a cleaning assembly having forward roller and rearward rollers counter-rotating with respect to each other. The rollers are arranged to substantially maintain a cross sectional area between the two rollers yet permitting collapsing therebetween as large debris is passed. Each roller includes a resilient elastomer outer tube and a partially air-occupied inner resilient core configured to bias the outer tube to rebound. The core includes a hub and resilient spokes extending between the inner surface of the outer tube and the hub. The spokes suspend the outer tube to float about the hub and transfer torque from the hub to the outer tube while allowing the outer tube to momentarily deform or move offset from the hub during impact with debris larger than the cross sectional area between the two rollers.