Folding Wagon Frame Stability and Wheel Locking Prevention
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Solution Overview
Problem
Conventional folding wagons face issues such as frame binding during folding/unfolding, instability due to wheel placement, and difficulty in connecting/disconnecting canopies, leading to user frustration and inefficient storage/transport.
Innovation Solution
The folding wagon features a frame with telescopic extensions for canopy support, front and rear wheels spaced ahead/behind the basket for stability, and a handle connected to the top of the basket support rod to prevent wheel locking, along with side support straps to prevent sagging and facilitate easy folding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the handle is connected near the bottom of the frame, then the wagon can be pulled, but the wheels lock up and the wagon stalls when hard pushing or pulling forces are applied
Solution Approach 1:
The handle connection point is moved from the bottom of the frame to the top of the front basket support rod, changing the spatial dimension of the connection point. This elevation changes the leverage and force distribution, preventing wheel locking while maintaining pulling capability
2Device complexity
If the wheels are located directly below the basket, then the wagon structure is compact, but the wagon becomes unstable and tips over when pulled rapidly or over steep surfaces
Solution Approach 1:
The wheels are repositioned from directly below the basket to an extended position at the front and rear of the basket. This spatial redistribution in the longitudinal dimension creates a wider wheelbase, improving stability without significantly increasing overall structural complexity
3Volume of moving object
If the wagon is folded to closed configuration, then the wagon becomes compact for storage, but the frame binds or sticks making it difficult to fold
Solution Approach 1:
The frame incorporates telescopic extensions with plugs and locking lips that allow dynamic adjustment during folding. The plug-and-locking-lip mechanism enables smooth transitions between extended and retracted states, preventing binding while achieving compact folding
4Reliability
If the canopy is connected to vertical canopy supports, then the canopy is held above the basket, but it is difficult to easily and reliably connect and disconnect the canopy
Solution Approach 1:
The canopy connection system is segmented into separate components: telescopic extensions with plugs, and canopy supports with locking lips. This segmentation allows the canopy to be independently connected and disconnected from the wagon frame, improving both reliability of retention and ease of operation
Data Source
AI summary
A folding wagon having a basket within which to carry articles and/or small children and a collapsible frame to enable the wagon to be folded between an expanded open configuration at which the basket is outstretched and a compact closed configuration at which the basket is collapsed. The wagon also has pairs of front and rear wheels that are spaced outwardly from the front and rear of the wagon so as to lie ahead of and behind the basket. A handle is connected to the top of the basket at the front of the wagon. When the wagon is folded to its compact closed configuration, the pairs of front and rear wheels are positioned in axial alignment to facilitate transport and/or storage. With the wagon folded, the axially-aligned pairs of wheels and the handle form a stand for supporting the wagon in an upright position.