Bridge Rope Splice Structure for Closed Loop Retention
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Solution Overview
Problem
Conventional harness ropes are made of inferior strength materials with high friction and high weight-to-strength ratio, which are susceptible to heat/friction damage and fail to maintain a closed loop formation under stress.
Innovation Solution
A harness rope structure featuring a main body with a splice forming an eye loop, where the first end is extended through the second end, creating a double layer of rope, secured with a stop knot and a friction hitch, using ultra-high molecular weight polyethylene (UHMWPE) to enhance strength and prevent movement, allowing high-strength materials to be used safely for bridge ropes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rope materials are used, then friction and weight are high, but strength is inferior
Solution Approach 1:
The patent changes the material parameter from conventional high-friction materials to UHMWPE (ultra-high molecular weight polyethylene), which has fundamentally different properties: extremely high strength-to-weight ratio and low friction coefficient. This material substitution resolves the contradiction by providing superior strength while reducing weight, despite the low friction characteristic.
2Strength
If high-strength low-friction materials like UHMWPE are used, then strength is improved and weight is reduced, but the rope fails to maintain closed loop formation under stress
Solution Approach 1:
The patent segments the rope into distinct functional zones: the eye loop section with extended buried ends for friction generation, the heat-shrunk intermediate section for structural integrity, and the main body for strength. This segmentation allows the low-friction UHMWPE material to maintain its strength advantages while creating a dedicated friction zone that prevents loop opening under stress.
Solution Approach 2:
The patent extends the rope ends in the longitudinal dimension, burying them significantly deeper than conventional designs (first end extending beyond the eye loop by at least 6 inches). This dimensional extension creates sufficient friction contact length to compensate for the low friction coefficient of UHMWPE, preventing the loop from opening under load.
3Reliability
If rope ends are extended deeper into the rope body, then friction increases and loop retention is improved, but the rope structure becomes more complex
Solution Approach 1:
The patent merges multiple functions into the extended buried ends: they provide friction for loop retention, structural reinforcement, and positioning for the heat-shrunk section. The heat-shrunk intermediate section simultaneously provides structural integrity and defines the eye loop geometry. This functional merging reduces the need for additional separate components, managing complexity while achieving reliable loop retention.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the safe use of high-strength materials by minimizing mechanical failure and maintaining a closed loop formation under stress, passing standardized drop tests and preventing damage from heat and friction.
Implementation Method 1
secured with a stop knot and heat shrink wrap
Data Source
AI summary
A bridge rope assembly includes a main body comprising a rope that has a first end and a second end. The rope has a splice therein to form an eye loop in the main body. The eye loop is configured to engage a first bridge loop of a harness. The main body comprises a first portion including the first end and a second portion including the second end. The first portion extends through the second portion of the main body such that the first end is positioned adjacent to the second end. A distance between the first and second ends is less than 2.0 inches.