Robotic Vacuum Roller Linkage for Hair-Free Carpet Transition
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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, with existing designs often leading to hair and string-like debris causing stalls and reduced cleaning efficiency.
Innovation Solution
The design incorporates a compressible, resilient roller with V-shaped chevrons and a four-bar linkage mechanism, which allows for adjustable height and parallel alignment to prevent hair wrapping, direct debris towards the center, and maintain airflow, while the linkage accommodates surface transitions and prevents the front roller from digging into carpets.
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 stalls and reduced performance
Solution Approach 1:
The roller transitions from a rigid structure to a compressible resilient structure, changing the physical parameter of rigidity to flexibility. This allows the roller to deform under compression when encountering hair and debris, preventing entanglement while maintaining cleaning effectiveness through the resilient recovery of the roller.
Solution Approach 2:
The roller is constructed with a compressible resilient material that forms a flexible shell structure. This flexible shell can deform and conform to the cleaning surface, allowing hair and debris to pass through or around the roller without becoming entangled, while still providing effective cleaning contact.
2Reliability
If the roller is made compressible and resilient to prevent hair wrapping, then reliability is improved, but cleaning effectiveness may be reduced
Solution Approach 1:
The roller transitions from a rigid structure to a compressible resilient structure, changing the physical parameter of rigidity to flexibility. This allows the roller to deform under compression when encountering hair and debris, preventing entanglement while maintaining cleaning effectiveness through the resilient recovery of the roller.
3Device complexity
If the front roller is fixed in position, then structural simplicity is maintained, but the roller digs into carpets reducing ease of operation
Solution Approach 1:
The front roller is changed from a fixed position to a movable position that can adjust vertically. The roller is mounted on a linkage mechanism that allows it to rise and fall dynamically, enabling the roller to maintain contact with the cleaning surface on hard floors while lifting off carpet surfaces to prevent digging and excessive friction.
4Productivity
If the roller width is increased to improve cleaning coverage, then productivity is improved, but the roller becomes more prone to hair entanglement
Solution Approach 1:
The roller is constructed with a compressible resilient material that forms a flexible shell structure. This flexible shell can deform and conform to the cleaning surface, allowing hair and debris to pass through or around the roller without becoming entangled, while still providing effective cleaning contact.
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
This solution enhances cleaning efficiency by preventing hair entanglement, maintaining airflow, and allowing the robotic vacuum to adapt to different surfaces, thereby improving user satisfaction and reducing maintenance needs.
Implementation Method 1
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
Implementation Method 2
a resilient compressible material disposed between the flexible tubular tube and the rigid drive shaft
Implementation Method 3
The one or more vanes contact debris on a cleaning surface and direct the debris in the direction of rotation of the compressible, resilient roller
Data Source
AI summary
An autonomous coverage robot includes a chassis having forward and rearward portions. A drive system is mounted to the chassis and configured to maneuver the robot over a cleaning surface. A cleaning assembly is mounted on the forward portion of the chassis and has two counter-rotating rollers mounted therein for retrieving debris from the cleaning surface, the longitudinal axis of the forward roller lying in a first horizontal plane positioned above a second horizontal plane on which the longitudinal axis of the rearward roller lies. The cleaning assembly is movably mounted to the chassis by a linkage affixed at a forward end to the chassis and at a rearward end to the cleaning assembly. When the robot transitions from a firm surface to a compressible surface, the linkage lifts the cleaning assembly from the cleaning surface.