Debris bins and mobile cleaning robots including same
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Solution Overview
Problem
Existing mobile cleaning robots face challenges in ensuring proper filter installation and debris bin management, leading to operational inefficiencies and potential damage due to improper filter presence and bin seating.
Innovation Solution
A mobile cleaning robot equipped with a filter presence system that includes a pivotable filter access door, a lift arm mechanism, and a bin retention system, which ensures the filter is correctly seated and the debris bin is securely positioned, preventing operation without proper installation and facilitating easy removal and replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter presence indicator system is implemented to prevent operation without proper filter installation, then reliability is improved, but device complexity increases
Solution Approach 1:
The filter unit itself contains the presence detection mechanism (detectable feature integrated into filter housing) and actively participates in verifying its own installation status by engaging with the sensor system, eliminating the need for separate complex detection apparatus
Solution Approach 2:
The patent replaces complex mechanical interlock systems with a sensor-based detection system that uses optical, capacitive, or other non-contact sensing methods to verify filter presence, reducing mechanical complexity while maintaining reliability
2Ease of operation
If a removable filter unit with access door is used to facilitate maintenance, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The filter system is divided into a removable filter unit and a fixed housing, allowing the filter element to be independently accessed, removed, and replaced without disassembling the entire device, thereby simplifying maintenance operations
Solution Approach 2:
The filter access door serves multiple functions: it provides access for filter replacement, houses the presence detection sensor, and acts as a structural component of the debris bin assembly, reducing overall device complexity through functional integration
3Ease of operation
If a lift arm mechanism is used to automatically position the filter unit during door closure, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The lift arm mechanism is passively actuated by the closing motion of the filter access door itself, which automatically raises the filter unit into its seated position without requiring separate motors or active control systems
Solution Approach 2:
The lift arm mechanism employs asymmetric geometry where the arm's path and engagement points are specifically designed to convert the linear closing motion of the door into the vertical lifting motion needed to position the filter unit, achieving automatic positioning with minimal components
4Reliability
If an interlock system is implemented to prevent door closure without filter, then reliability is improved, but ease of operation worsens
Solution Approach 1:
The sensor system detects filter presence before the door closure operation is completed, and the lift arm mechanism pre-positions the filter unit during door closure, ensuring proper installation is verified in advance of final door latching
Solution Approach 2:
The lift arm acts as an intermediary mechanism that facilitates proper filter positioning during door closure, mediating between the user's closing action and the required filter installation state, thereby maintaining ease of operation while ensuring reliability
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
Ensures the filter is correctly installed and the debris bin is securely seated, preventing operational errors and damage, while allowing for easy maintenance and operation.
Implementation Method 1
Moving the filter access door from the open position into the closed position causes the lift arm to move to the retracted position, thereby raising the filter unit from a lowered position to an installed position
Data Source
Figure 1
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AI summary
A mobile cleaning robot includes a removable filter unit configured to receive a supply airflow generated by a blower and to filter debris from the supply airflow, a filter seat, a filter access opening, a filter access door, and a filter presence system. The filter access door is pivotable between a closed position, wherein the filter access door covers the filter access opening, and an open position, wherein the filter access door is displaced from the filter access opening to permit access to the filter seat. The filter presence system is configured to: permit the filter access door to move from the open position into the closed position when the filter unit is disposed in the filter seat; and prevent the filter access door from being moved into the closed position when the filter unit is not disposed in the filter seat. The filter presence system includes a lift arm movable between an extended position and a retracted position. When the filter access door is open, the lift arm assumes the extended position to receive the filter unit in the filter seat. Moving the filter access door from the open position into the closed position when the filter unit is disposed in the filter seat causes the lift arm to move to the retracted position.