Convertible Barrow Twist-Lock Handle Leg Mechanism
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Solution Overview
Problem
Prior convertible barrows with detachable legs often have mechanisms that are difficult to operate, impeding the conversion between barrow and trailer configurations.
Innovation Solution
A barrow design featuring removable handles with a twist-lock mechanism that locks legs in the unfolded position, allowing easy conversion between configurations, with a shaft that biases towards an extended position and stop surfaces to secure the leg in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If detachable legs are used to enable conversion between barrow and trailer configurations, then adaptability is improved, but the mechanism becomes difficult to operate
Solution Approach 1:
The patent combines the leg attachment mechanism with the handle attachment mechanism into a single integrated system. The legs are attached to the barrow frame at the same locations where handles are attached, using identical coupling mechanisms. This merging allows the same structural elements to serve dual purposes: supporting the barrow during use and enabling trailer configuration when detached, thereby improving adaptability without adding complex separate mechanisms that would increase operational difficulty
Solution Approach 2:
The coupling mechanism serves multiple functions: it attaches the handles to the barrow frame during barrow operation, it secures the legs in the unfolded position for barrow use, and it enables easy detachment for trailer conversion. This multi-functional design eliminates the need for separate complex mechanisms for each function, making the conversion process simple and intuitive while maintaining structural integrity across different configurations
2Adaptability or versatility
If legs are made detachable for trailer conversion, then adaptability is improved, but structural stability deteriorates
Solution Approach 1:
The patent incorporates stop surfaces that are pre-positioned on the barrow frame before the legs are attached. These stop surfaces engage with corresponding features on the legs when the legs are in the unfolded position, automatically limiting their movement and preventing over-extension or detachment during normal barrow operation. This preliminary positioning mechanism ensures structural stability is maintained without requiring complex locking systems, as the geometry of the stop surfaces inherently prevents unintended movement
Solution Approach 2:
The leg structure is segmented into distinct attachment points with specific geometric features (stop surfaces, coupling interfaces) that are independently designed to fulfill specific functions. The stop surfaces are segmented from the main frame structure, allowing them to independently constrain leg movement. This segmentation enables the legs to be securely attached during barrow use while maintaining the capability for clean detachment when conversion to trailer configuration is required, thus preserving structural stability without compromising adaptability
Data Source
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AI summary
A barrow includes a tray; one or more wheels; one or more removable handles, each including a first handle coupling; one or more leg units, each including a leg having a folded position in which the leg is folded against the tray and an unfolded position in which the leg extends downwards from the tray; and one or more second handle couplings each configured to couple with one of the first handle couplings to attach one of the one or more removable handles to the barrow; wherein attachment of the one or more removable handles to the barrow locks the one or more legs in the unfolded position. The barrow may be convertible between a barrow configuration and a trailer configuration.