Removable Twistlock for Cambered Flatbed Trailer Stability
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Solution Overview
Problem
Cambered flatbed trailers cause instability and unsafe transportation conditions for shipping containers due to uneven contact, leading to potential cargo shifting, and existing modifications are costly and time-consuming.
Innovation Solution
A removable twistlock device that secures shipping containers to cambered flatbed trailers by using a base plate with adjustable legs and a twistlock assembly, ensuring even support and stability through standardized corner fittings and locking mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If containers are placed on cambered flatbed trailers, then the trailers can bear heavy loads, but the containers become unstable and unsafe due to uneven contact
Solution Approach 1:
The twistlock device serves as an intermediary between the container and the cambered trailer surface. It includes a vertical post that extends from the trailer floor through the container's corner fitting, and a base plate with adjustable legs that contact the cambered surface. This intermediary mechanism transfers the load from the container through the twistlock to the trailer while compensating for the camber, thereby maintaining both load bearing capacity and container stability.
2Stability of the object's composition
If cambered flatbed trailers are modified to prevent uneven distribution, then container stability improves, but the modifications are expensive and time-consuming
Solution Approach 1:
The twistlock device is designed to be self-adjusting through its base plate with multiple adjustable legs. The legs can be positioned at different lengths to automatically compensate for the cambered surface irregularities, eliminating the need for expensive and time-consuming trailer modifications. The device serves itself by adapting to the cambered surface geometry through simple mechanical adjustment rather than requiring complex trailer restructuring.
3Ease of operation
If traditional twistlocks are used on cambered trailers, then installation is simple, but the containers experience uneven support and cargo shifting
Solution Approach 1:
The twistlock device incorporates dynamic adjustability through its base plate with multiple legs of varying lengths. The legs can be adjusted to different positions to match the cambered surface profile, allowing the device to adapt dynamically to surface irregularities. This maintains installation simplicity while achieving even support distribution, as the adjustment mechanism is designed into the base plate structure itself.
Data Source
AI summary
A device for securing a container to a trailer has a base with at least one leg for bolting to the trailer and a twistlock coupled to the base. The twistlock, when actuated, engages an opening in a corner fitting of the container such that the container is securely attached to the trailer.