Pivotable Container Lawn Cart for Efficient Unloading
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Solution Overview
Problem
Current lawn and garden carts are cumbersome to maneuver and require manual handling to dump contents, as they can only pivot up to 55 degrees, making it difficult to unload materials efficiently.
Innovation Solution
A lawn and garden cart design with a pivotable container that can rotate over 90 degrees, allowing for full unloading by detaching from the tow bar and pivoting up to 180 degrees, enhancing maneuverability and dumping efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the container is rigidly coupled to the axle with limited pivot range (up to 55 degrees), then the cart structure is simple and stable, but the cart becomes difficult to maneuver and requires manual handling to dump contents
Solution Approach 1:
The patent applies the dynamics principle by transforming the rigid, fixed-angle container coupling into a dynamic system with multi-stage pivot capability. The container is decoupled from the axle and re-coupled to the tow bar through a pivot mechanism that enables both initial rotation (first pivot angle) and subsequent full dumping rotation (second pivot angle). This dynamic coupling allows the container to adapt its orientation based on operational needs, achieving both maneuverability and efficient dumping while maintaining structural simplicity through the use of basic pivot joints and coupling mechanisms.
2Productivity
If the container pivot range is limited to 55 degrees, then the cart structure remains simple, but the productivity decreases due to manual handling requirements for unloading
Solution Approach 1:
The patent implements preliminary action by designing a coupling mechanism that pre-prepares the container for full dumping motion. The container is initially coupled to the tow bar in a transport position, and the pivot mechanism is pre-configured to enable automatic full dumping when the container is released. This eliminates the need for manual intervention during unloading, as the system is already prepared to execute the complete dumping motion (from transport position through first pivot angle to second pivot angle) without requiring user input, thereby significantly improving productivity.
3Adaptability or versatility
If the container is selectably secured to the tow bar with multi-angle pivot capability, then the unloading efficiency improves, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the container coupling system into distinct functional segments: the axle assembly, the tow bar assembly, and the container assembly with intermediate pivot joints. The coupling mechanism is segmented into a first coupling that allows initial rotation and a second coupling that enables full dumping rotation. This segmentation allows each component to perform its specific function independently, achieving multi-angle pivot capability and adaptability while keeping individual components simple and manageable, thus reducing overall system complexity.
Data Source
AI summary
A towable cart including an axle, at least one bearing rotatably coupled to the axle, a frame configured for selectable attachment to the bearing, and a container attached to the frame. A tow bar has a first and a second end, and is coupled to the axle at the first end of the tow bar. A first end of a tip structure is pivotally coupled to the container and a second end of the tip structure is fixedly attached to the bearing. An arm is attached to the container and is selectably coupled to the tow bar. The container is in a loading condition when the arm is coupled to the tow bar and is in an unloading condition when the arm is not coupled to the tow bar. The container is movable between the loading condition and the unloading condition over a pivoting range greater than ninety degrees.