Beveled Cap Chain Tie-Down for Easy Cargo Removal
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Solution Overview
Problem
Existing chain tie-down systems for securing cargo on transportation vehicles are difficult to remove, especially when corroded, as they are often secured directly to the vehicle floor, leading to operational challenges.
Innovation Solution
A cap-based system where the cap is mounted on the vehicle floor with a beveled portion that fits into an aperture, allowing easy release and removal of the chain by tipping it up, enabling secure attachment under tension and easy access for handling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the chain tie-down is secured directly to the vehicle floor, then the attachment is firm and secure under tension, but the removal becomes difficult especially when corroded
Solution Approach 1:
The tie-down system is divided into two separate components: a floor-mounted base piece that remains permanently attached to the vehicle floor, and a removable cap that fits over the base piece. This segmentation allows the permanent part (base) to provide secure attachment strength while the removable part (cap) can be easily taken off even when corroded, resolving the contradiction between strong attachment and easy removal.
2Reliability
If the chain tie-down is mounted permanently to the vehicle floor, then the structural integrity is maintained, but the maintenance and replacement time increases
Solution Approach 1:
By segmenting the tie-down into a permanent base piece and a removable cap, the system maintains structural integrity through the permanently mounted base while allowing rapid replacement of the cap component. This reduces maintenance time significantly compared to removing entire welded or bolted assemblies, as the cap can be simply pulled off even when corroded.
3Strength
If the tie-down uses a complex securing mechanism, then the attachment strength increases, but the device complexity increases
Solution Approach 1:
The complex securing mechanism (welds, bolts, or other permanent fastening methods) is extracted and replaced by a simple friction-fit or interference-fit cap that snaps onto the base piece. This extraction of complexity allows the system to maintain attachment strength through proper cap-to-base engagement while eliminating complicated mounting and removal procedures.
Data Source
AI summary
A device has a chain fitting which is connected to the floor of a transportation vehicle, such as a flatbed trailer. The chain fitting has a cap on one end thereof, which is installed in a mating aperture formed in the vehicle floor. The side rail has an aperture opposite the floor aperture, this aperture having a smaller diameter than the floor aperture. A side rail is installed along an edge of the floor, tis side rail having an aperture positioned opposite the aperture in the floor and having a smaller diameter than the floor aperture. The cap is installed on the top side of the floor with a short chain piece attached thereto running through the aperture with a second cap at the lower end which is secured to the lower end of the chain. A length of securing chain is attached to the chain fitting, this securing chain being attached to cargo to be restrained. The cap is partially beveled along its contact surface with the floor and engages the sides of the aperture in the floor. This beveled portion operating in conjunction with the aperture sides enables ready release of the cap with one's fingers.