Waste Container Locking Device Asymmetric Cam Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing locking devices for waste containers fail to prevent spillage when the container is knocked over or intentionally tipped, and they often deteriorate due to exposure to elements.
Innovation Solution
A locking device with a magnetic paddle mechanism that distinguishes between unintended and intentional tipping, using a cam and paddle system to keep the lid closed during sudden impacts but allowing opening when tipped intentionally, featuring a magnetic attachment for the paddle and a blocking device to prevent unwanted opening.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a metal coil is used to provide tension holding the lid in place, then the locking strength is improved, but the coil deteriorates due to exposure to the elements
Solution Approach 1:
The patent replaces the durable but environmentally vulnerable metal coil with a plastic locking arm that is less susceptible to environmental deterioration. The locking arm is designed to be replaceable if needed, trading long-term durability for environmental resistance.
2Device complexity
If a strap is used in a snap lock fashion to secure the lid, then the locking mechanism is simple, but the strap can easily become separated from the container
Solution Approach 1:
The patent uses a cam mechanism with a curved surface that interacts with a sloped surface on the locking arm. This curved geometry creates a self-locking action that prevents the locking arm from disengaging, eliminating the separation problem while keeping the mechanism simple.
3Extent of automation
If a gravity actuated mechanism is used to allow opening when tilted, then the dumping operation is automated, but the container cannot be opened when knocked over on its side
Solution Approach 1:
The patent employs asymmetric geometry in the cam and locking arm surfaces, with specific slope orientations that respond differently to forces applied from different directions. This allows the mechanism to unlock when tipped forward for dumping while remaining locked when knocked over on its side.
Solution Approach 2:
The locking mechanism transitions from a static connection to a dynamic system where the locking arm can pivot and the cam can rotate, allowing the locking state to change based on the direction and magnitude of applied forces during tipping operations.
4Ease of operation
If the lid is removably coupled in a friction-fit manner to allow easy removal, then the ease of operation is improved, but the contents can be undesirably expelled when the lid is not secured
Solution Approach 1:
The patent divides the lid connection system into two independent functions: the friction-fit connection for easy attachment and removal, and the separate locking arm mechanism for secure containment. This segmentation allows each function to optimize its performance independently.
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
Effectively prevents spillage by maintaining the lid closed during accidental knocks and allowing intentional dumping, while being resistant to environmental deterioration.
Implementation Method 1
the second end of the paddle is detachably mounted to a mounting surface, by magnetic attraction
Data Source
Figure 1
Figure 2
Figure 3
AI summary
A locking device for a container is provided, preferably for a waste container. The locking device keeps the lid (12) of the container (18) closed when the container (18) is knocked over on its side, with a sudden jerking or jarring motion, such as by impact with the ground, to prevent spillage of its contents. The locking device, however, allows the lid (12) to open when the waste container is tipped over, preferably in a forward direction, by a dumping operation.