Wheelbarrow Back Wheel Pivot Mechanism for Load Stability
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Solution Overview
Problem
Traditional wheelbarrows require the operator to bear a significant portion of the load while moving, and when stationary, they become unstable due to the distribution of weight, necessitating a design that allows wheels to support more of the load during movement and stabilize the device when resting.
Innovation Solution
A wheelbarrow system featuring a hinge joint that allows the back wheel to pivot between two positions, enabling the wheels to bear the bulk of the load during movement and stabilize the device on legs when stationary, with a mechanism that includes a mounting shaft, spherical joint, and locking pins for secure positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the wheelbarrow uses traditional legs and front wheel configuration, then the structure is simple and easy to manufacture, but the operator must bear a large portion of the load and the wheelbarrow becomes unstable when stationary
Solution Approach 1:
The back wheel is made movable through a hinge joint connection to the chassis, allowing it to pivot between a first position (contacting the surface) and a second position (raised off the surface). This dynamic configuration enables the wheelbarrow to adapt its structure based on operational needs, resolving the contradiction between operational ease and structural complexity.
Solution Approach 2:
The wheelbarrow is divided into functional segments: the back wheel assembly that can independently pivot, the chassis that provides structural support, and the legs that provide stability. This segmentation allows each component to perform its specific function optimally while maintaining overall system simplicity.
2Weight of moving object
If additional wheels are added to support more load, then the load-bearing capacity improves, but the wheelbarrow becomes unstable in a resting position
Solution Approach 1:
The back wheel is designed to dynamically change position between contacting the surface (first position) and being raised off (second position). When the wheelbarrow is stationary, the back wheel can pivot to the first position where the legs contact the surface, providing stability. When moving, the back wheel can pivot to the second position to support load, resolving the contradiction between load-bearing capacity and stability.
3Productivity
If the back wheel is fixed in position, then the structure is stable, but the wheelbarrow cannot transition between movement and resting positions efficiently
Solution Approach 1:
The hinge joint connection enables the back wheel to dynamically pivot between first and second positions, allowing efficient transition between movement and resting states. The joint mechanism is simple yet effective, providing the necessary mobility without excessive complexity.
Solution Approach 2:
The back wheel assembly is designed to self-position through the hinge joint mechanism, allowing the wheelbarrow to automatically transition between operational positions without requiring complex external control systems or additional actuators.
Data Source
AI summary
The present invention comprises a wheelbarrow for use on a surface. The wheelbarrow is generally comprised of a first and second handle, a receptacle, a chassis, at least one leg, a front wheel, a back wheel and an assembly. The assembly includes a on which allows back wheel to pivot between a first position and a second position. When the back wheel is in the first position, the legs are in contact with the surface. When the back wheel is in the second position the legs are raised off of the surface.