Folding Wagon Handle Pivot Layout for Push-Pull Maneuverability
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Solution Overview
Problem
Conventional wagons with four wheels are cumbersome and difficult to maneuver, especially when reversing, and lack a convenient mechanism for changing the handle position to facilitate both pulling and pushing.
Innovation Solution
A collapsible folding wagon with a frame that includes pivotable support members and a handle system allowing easy transition between pulling from the front and pushing from the rear, featuring a flexible receptacle and independently spinnable front wheels with rear wheels that rotate in planes offset from the front wheels, enabling compact storage and easy maneuverability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wagon uses a conventional fixed handle at the front end, then the wagon structure is simple, but the wagon is difficult to maneuver when reversing and cannot be easily pushed from the rear
Solution Approach 1:
The handle is made dynamically repositionable through pivot connections at the first and second pivot locations. The handle support members can rotate relative to the frame, allowing the handle to transition between front-end pulling position and rear-end pushing position. This dynamic adjustment capability resolves the contradiction by enabling multiple operational modes without requiring multiple fixed handle structures.
Solution Approach 2:
The single handle system serves multiple functions: it can be positioned at the front end for pulling the wagon forward, repositioned to the rear end for pushing the wagon forward, and used for reversing. This multi-functional handle design eliminates the need for separate handles for different operational modes, improving ease of operation while maintaining reasonable structural complexity.
2Ease of operation
If the wagon frame is made rigid and non-folding, then the wagon structure is simple and stable, but the wagon is cumbersome to store and transport
Solution Approach 1:
The frame is segmented into multiple support members (front end support members, rear end support members, right side support members, left side support members) connected by pivot connections. These segmented components can fold relative to each other, allowing the entire frame to collapse into a compact configuration for storage while maintaining structural integrity during use.
Solution Approach 2:
The frame transitions between two dynamic states: an extended operational configuration where the support members form a stable rectangular structure, and a collapsed storage configuration where the support members fold inward. The pivot connections enable this dynamic transformation, resolving the contradiction between structural stability and storage convenience.
3Ease of operation
If the wagon uses fixed wheels that rotate only in forward direction, then the wheel structure is simple, but the wagon cannot maneuver in reverse effectively
Solution Approach 1:
The front wheels are made independently spinnable, allowing them to rotate freely in both forward and reverse directions, and even spin laterally for steering. This dynamic wheel configuration enables effective reversing and maneuvering without requiring complex differential mechanisms or reversible drive systems.
Solution Approach 2:
Each front wheel operates independently from the other, allowing individual rotation and steering. This segmentation of wheel control enables sophisticated maneuvering capabilities including reversing, tight turns, and lateral movement, while keeping each individual wheel structure relatively simple.
4Reliability
If the receptacle is made rigid and fixed to the frame, then the receptacle provides stable support, but the receptacle cannot accommodate the folded and unfolded states of the frame
Solution Approach 1:
The receptacle is made of flexible material that can deform and adapt its shape. When the frame is in the unfolded operational state, the receptacle maintains its normal rigid-like structure for stable support. When the frame is folded, the flexible receptacle material allows the receptacle to compress and reconfigure, maintaining engagement with the frame throughout the transformation while preserving structural integrity.
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
The wagon provides ease of use, compact storage, and improved maneuverability by allowing handle position change and incorporating a braking mechanism, reducing assembly complexity and enhancing stability and steering capabilities.
Implementation Method 1
the right side support members are pivotally engaged at a first pivot connection and the left side support members are pivotally engaged at a second pivot connection
Implementation Method 2
each of the first and second handle support members includes a first telescopic section, a second telescopic section, and a pivot connection
Implementation Method 3
each of the first and second telescopic sections includes a spring biased button
Implementation Method 4
The front wheels are independently spinnable and the rear wheels rotate in planes offset from the front wheels
Data Source
AI summary
The present collapsible folding wagon includes a frame that folds. The frame includes right side oblique support members that pivot relative to each other at a right side pivot location and left side oblique support members that pivot relative to each other at a left side pivot location. The right side and left side pivot locations are equidistance from a front end of the frame and a rear end of the frame. A U-shaped handle is pivotally engaged at the right and left side locations and may swing over the wagon from a pull or push position at the front of the wagon to a pull or push position at the rear of the wagon.