Bridge Rope Assembly Splice Design for Harness Strength
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Solution Overview
Problem
Conventional harness ropes are of inferior strength and have a higher coefficient of friction and weight-to-strength ratio, making them unsuitable for high-stress applications and prone to damage from heat or friction, and they often fail to maintain a closed loop formation.
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 to create a double layer, secured with a stop knot and a friction hitch, using ultra-high molecular weight polyethylene (UHMWPE) to enhance strength and prevent movement, allowing for the use of high-strength materials that are otherwise susceptible to damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional rope materials are used, then the rope has higher coefficient of friction and weight-to-strength ratio, but the strength is inferior and the rope is prone to heat/friction damage
Solution Approach 1:
The patent introduces an intermediary protective system consisting of nested burr knots and friction hitches that mediate between the high-strength rope material and the external environment. These intermediaries protect the rope from direct heat and friction contact while allowing the high-strength material to bear the load, thus resolving the contradiction between using strong materials and protecting them from damage.
Solution Approach 2:
The patent applies beforehand cushioning by pre-positioning multiple protective friction hitches and burr knots along the rope assembly before stress is applied. These protective elements are arranged in advance to cushion and distribute any heat or friction damage that may occur during operation, preventing direct damage to the high-strength rope material.
2Strength
If high-strength materials are used, then the rope strength increases, but the materials are susceptible to heat/friction damage and do not retain closed loop formation
Solution Approach 1:
The patent employs nested doll principle by creating a nested structure of protective elements around the high-strength rope. Multiple burr knots and friction hitches are nested within each other and along the rope length, forming concentric protective layers that maintain the closed loop formation while protecting the inner high-strength material from damage that would cause deformation.
Solution Approach 2:
The patent creates a composite structure combining the high-strength rope material with multiple protective friction hitch elements and burr knots. This composite assembly maintains the closed loop formation through the collective action of all components, where the protective elements compensate for the high-strength material's tendency to deform under heat and friction.
3Stability of the object's composition
If the first end is extended through the second end to create double layer, then the closed loop formation is maintained under stress, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the protective structure into distinct modular segments: eye splices at the loop formation, burr knots at the extended ends, and friction hitches distributed along the rope length. This segmentation allows each component to perform its specific function while maintaining the overall closed loop stability, making the complex structure more manageable and systematic.
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 ensuring the rope structure remains intact.
Implementation Method 1
a friction hitch, using ultra-high molecular weight polyethylene (UHMWPE) to enhance strength and prevent movement
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.