Robot Debris Bin Filter Door With Lift-Arm Presence Lock
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Solution Overview
Problem
Mobile cleaning robots face challenges in efficiently managing debris collection and filter maintenance, particularly in ensuring proper filter installation and bin retention during operation, which affects airflow and debris containment.
Innovation Solution
The mobile cleaning robot incorporates a filter presence system with a pivotable filter access door and lift arm mechanism that ensures the filter is properly seated and secured, and a bin retention system with a latch mechanism that securely holds the debris bin in place, preventing accidental removal during operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a filter presence system with lift arm mechanism is implemented, then filter installation reliability is improved, but device complexity increases
Solution Approach 1:
The lift arm mechanism automatically raises when the filter access door is opened, and the filter unit is self-positioned into the filter seat without requiring manual manipulation of the lift arm. The system serves itself by using the door opening action to trigger the lift arm movement, eliminating the need for separate control mechanisms.
Solution Approach 2:
The spring-loaded lift arm is designed to be at mechanical equilibrium in both the retracted and extended positions, allowing smooth transition between states without requiring excessive force. The spring force balances the gravitational and frictional forces, creating an equipotential system that reduces operational complexity.
2Ease of operation
If the filter access door is made pivotable between open and closed positions, then ease of filter replacement is improved, but structural complexity increases
Solution Approach 1:
The filter access door is segmented from the main robot body, allowing it to pivot independently between open and closed positions. This segmentation enables easy filter replacement while maintaining a relatively simple hinge connection rather than requiring complex locking or sealing mechanisms.
3Reliability
If a bin retention system with latch mechanism is implemented, then bin retention reliability is improved, but device complexity increases
Solution Approach 1:
The latch mechanism automatically engages with the bin during the closing motion of the filter access door, and the spring force maintains the latched position without requiring active control. The system uses the natural closing motion to trigger retention, eliminating the need for separate locking actions or control systems.
4Ease of operation
If the lift arm is spring-loaded to automatically extend when the filter access door opens, then ease of filter access is improved, but manufacturing complexity increases
Solution Approach 1:
The spring-loaded lift arm operates in a periodic cycle: it extends when the door opens and retracts when the door closes. This periodic action is achieved through simple spring-mechanism coupling rather than complex actuation systems, maintaining ease of manufacture while providing automatic operation.
Data Source
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.