Collapsible Wagon Parallel-Bar Chassis for Compact Folding
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Solution Overview
Problem
Existing collapsible wagons have complex structures, large volumes when collapsed, and are prone to deformation or fracture due to concentrated stress, making them inconvenient to use, store, and transport.
Innovation Solution
A collapsible wagon design featuring a simplified structure with a chassis assembly comprising parallel-bars structures hinged to a groove connector, allowing for synchronous movement and easy collapsing or expanding, while eliminating side supports to reduce volume and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If side supports and complicated structures are used in existing collapsible wagons, then the structural strength is improved, but the device complexity increases and the collapsed volume becomes larger
Solution Approach 1:
The patent removes the side supports from the traditional collapsible wagon structure, extracting the unnecessary components that contributed to complexity and large collapsed volume. The remaining structure uses parallel bars hinged to a groove connector, achieving strength without the complicated side support framework.
Solution Approach 2:
The chassis is divided into multiple parallel bars (first parallel-bars and second parallel-bars) that are hinged to a groove connector. This segmentation allows the structure to maintain strength through distributed load-bearing elements while enabling compact folding when collapsed.
2Strength
If side supports and complicated structures are used in existing collapsible wagons, then the structural strength is improved, but the collapsed volume increases making it inconvenient to carry and store
Solution Approach 1:
By removing the side supports entirely, the patent eliminates the volume occupied by these components in the collapsed state. The simplified structure of parallel bars hinged to a groove connector folds into a much more compact form, reducing the collapsed volume significantly while maintaining necessary structural strength.
3Device complexity
If the force applied downward to the bottom support is concentrated in the middle, then the structure is simple, but it causes deformation or fracture of the bars
Solution Approach 1:
The bottom support structure is segmented into multiple parallel bars (first parallel-bars and second parallel-bars) that share the load. This segmentation distributes the downward force across multiple elements rather than concentrating it in the middle, preventing deformation and fracture while maintaining structural simplicity.
Solution Approach 2:
The parallel bars are hinged to a common groove connector, merging them into a unified structure that distributes forces evenly. This combination allows the load to be shared across all parallel bars rather than concentrated at a single point, improving reliability without adding complexity.
4Volume of moving object
If a simplified structure without side supports is used, then the collapsed volume is reduced and ease of operation is improved, but the structural strength may be compromised
Solution Approach 1:
The simplified structure uses multiple parallel bars segmented along the length of the chassis. These segmented elements distribute the load and provide structural strength without requiring side supports, maintaining both strength and compactness when collapsed.
Solution Approach 2:
The structure combines multiple parallel bar elements with a groove connector to create a composite framework. This composite arrangement provides the necessary structural strength through the distributed architecture of parallel bars while keeping the overall structure simple and compact when collapsed.
Data Source
AI summary
A collapsible wagon is provided. The collapsible wagon includes: a support assembly including a first support and a second support that are spaced apart in a first direction; and a chassis assembly arranged between the first support and the second support and including a first chassis hinged to the first support and a second chassis hinged to the second support. The first chassis is configured to comprise a first parallel-bars structure vertically arranged, and the second chassis is configured to comprise a second parallel-bars structure vertically arranged. The first parallel-bars structure and the second parallel-bars structure are hinged to a groove connector, and are configured to respectively drive the first chassis and the second chassis to move synchronously in response to movement of the groove connector in a vertical direction. The present disclosure adopts a chassis assembly having parallel-bars structures, which improves support strength.