Collapsible Wagon Scissor-Frame Mechanism
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Solution Overview
Problem
Existing collapsible hand-drawn wagons often have flimsy frames and difficulty in proper folding of the pliable liner during collapse, making them hard to store compactly and use efficiently.
Innovation Solution
A collapsible wagon design featuring a robust frame with scissor-bar and telescoping pole assemblies that adjust in height and width, along with a pliable liner and adjustable tow handle, allowing for easy conversion between expanded and collapsed configurations, ensuring compact storage and ease of use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a collapsible wagon uses a pliable liner that folds during collapse, then the wagon can be compacted for storage, but it is difficult to ensure the pliable liner folds properly and the frame becomes flimsy
Solution Approach 1:
The frame transitions from a static rigid structure to a dynamic collapsible structure using scissor-bar assemblies that can pivot and telescoping pole assemblies that can extend and retract. This allows the frame to dynamically change its volume while maintaining structural integrity through controlled mechanical movement rather than relying on a flimsy collapsible design
Solution Approach 2:
The frame is divided into multiple scissor-bar assemblies and telescoping pole assemblies that can independently collapse and compress. This segmentation allows the large volume of the expanded frame to be systematically reduced into a compact storage configuration while maintaining strength through the distributed mechanical structures
2Volume of moving object
If a collapsible wagon uses a flimsy frame to allow collapse, then the wagon can be compacted for storage, but the wagon lacks structural strength and robustness
Solution Approach 1:
The frame employs dynamic mechanical assemblies (scissor-bar and telescoping pole structures) that provide full structural strength in the expanded configuration and systematically compress to a compact form in the collapsed configuration, eliminating the need for a permanently flimsy frame design
Solution Approach 2:
The scissor-bar assemblies and telescoping pole assemblies nest together during collapse, with components fitting within each other to achieve compact storage volume while maintaining the potential for full structural strength when expanded
3Ease of operation
If a collapsible wagon is designed to be easily collapsed, then the wagon can be quickly compacted for storage, but the pliable liner does not fold properly
Solution Approach 1:
The scissor-bar assemblies and telescoping pole assemblies serve as intermediary mechanical structures that guide and control the collapse process. These intermediaries ensure that the pliable liner folds properly by providing structured pathways and support during the transition from expanded to collapsed configuration
Solution Approach 2:
The frame structure is pre-configured with scissor-bar and telescoping pole assemblies that are designed to guide the collapse process in a predetermined sequence. This preliminary structural arrangement ensures that the pliable liner follows the correct folding path without requiring complex manual manipulation
Data Source
AI summary
A collapsible wagon comprises a frame, four wheels, a pliable liner, and a telescoping tow handle. The frame has four sides that are each formed by a respective scissor-bar assembly. The frame also has a vertically oriented telescoping pole assembly at the intersection of each pair of the scissor-bar assemblies. The frame is configured such that, as the wagon is altered from its expanded to its collapsed configuration, the scissor-bar assemblies and the telescoping pole assemblies increase in height and the scissor-bar assemblies decrease in width. Each of the four wheels is attached to a bottom end portion of a respective one of the telescoping pole assemblies. The pliable liner is connected to the frame and defines an open-top interior compartment of the wagon when the wagon is in its expanded configuration. The telescoping tow handle is adjustable between collapsed and expanded configurations.