Convertible Handle for Manual and Vehicle Towing
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Solution Overview
Problem
Existing convertible handles for towed carts or wagons are either too bulky, complex, and costly, or not suitable for lighter vehicles with pin-type connections, making them inefficient for manual and vehicle towing.
Innovation Solution
A convertible handle with a grip portion that slides along a shaft, allowing for easy conversion between manual pulling and vehicle towing configurations, using a few components and no separate storage, with a design that includes a tongue for coupling to a towing vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a rigid handle with locking mechanism is used for manual pulling, then manual maneuverability is improved, but the device becomes bulky and heavy
Solution Approach 1:
The handle is divided into two functional segments: a grip portion for manual pulling and a tongue portion for vehicle attachment. These segments can be positioned along the shaft according to need, allowing the user to have manual maneuverability when needed without permanently carrying a bulky rigid handle structure.
Solution Approach 2:
The handle transitions from a static rigid structure to a dynamic adjustable structure. The grip portion can be moved along the shaft and locked at different positions, and the tongue can be deployed or retracted as needed. This dynamic configuration allows the handle to adapt between manual and vehicle-towed modes, reducing weight when manual pulling is not required.
2Ease of operation
If a spring-loaded twist-locking arrangement is used to accommodate the handle, then manual pulling capability is improved, but the tongue member requires a large cross-section
Solution Approach 1:
The handle assembly is segmented into the grip portion and the tongue portion, which can be positioned independently along the shaft. This segmentation allows the tongue to be deployed only when needed for vehicle attachment, eliminating the need for a large cross-section tongue member that would be required if the entire structure needed to accommodate both functions simultaneously.
Solution Approach 2:
The grip portion and tongue portion are nested along the same shaft, with the tongue able to be retracted into or along the shaft when not in use. This nesting arrangement allows the tongue member to have a small cross-section while still providing the necessary functionality when deployed, as it shares the space along the shaft rather than requiring lateral expansion.
3Adaptability or versatility
If a convertible handle with rotatable portions is used to switch between manual and powered movement, then versatility is improved, but the device becomes bulky, heavy, and complex to manufacture
Solution Approach 1:
The convertible handle is segmented into modular components (grip portion, tongue portion, shaft, locking mechanism) that can be independently manufactured and assembled. This segmentation simplifies manufacturing compared to a monolithic rotatable design, as each component can be produced using standard fabrication processes and then assembled through straightforward assembly operations.
Solution Approach 2:
The handle is designed as a universal multi-functional device where the same basic structure serves both manual pulling and vehicle attachment functions. The grip portion and tongue portion can be positioned and locked at various locations along the shaft, providing versatility without requiring multiple separate components or complex transformation mechanisms. The simple locking mechanism accommodates both functions with a single basic design.
Data Source
AI summary
A convertible handle having a shaft portion and a grip portion. The grip portion is configured to slide along the length the shaft portion to expose a tongue on the shaft portion. In a manual configuration, the grip portion is used for manually pulling a cart. When not in the manual configuration, the shaft may be attached to a vehicle via the tongue for towing by vehicle.