Four-Layer Webbing Climbing Quickdraw Wear Resistance
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Solution Overview
Problem
Conventional quickdraws used in climbing and other safety applications are prone to wear over time, leading to reduced strength and potential safety hazards, especially when used in indoor climbing gyms where frequent inspection is less common.
Innovation Solution
The quickdraw device features a fabric loop with a specific arrangement of four-layered webbing, where the ends do not overlap, providing increased fabric-to-fabric strength and using braided or woven nylon webbing with high-strength ultra-high molecular weight polyethylene fibers, and a cover to protect exposed cut ends.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional double-layer webbing is used in quickdraws, then the device meets basic strength standards, but the webbing wears over time reducing safety
Solution Approach 1:
The patent uses four layers of webbing arranged in a specific configuration where the grain directions of adjacent layers are perpendicular to each other. This composite structure combines multiple material layers with different orientations to achieve superior wear resistance and strength compared to conventional single or double-layer webbing, directly addressing the reliability and service life contradiction.
Solution Approach 2:
The invention transitions from conventional double-layer webbing to a four-layer configuration with perpendicular grain directions. This dimensional change in the webbing structure creates a more robust construction that resists wear from multiple directions, thereby extending service life while maintaining reliability.
2Strength
If more webbing layers are added to increase strength, then breaking strength increases, but device weight increases
Solution Approach 1:
The patent applies the four-layer webbing construction specifically at critical stress points where the webbing interfaces with carabiners and where grain direction changes occur. This localized enhancement of quality provides maximum strength where needed most without uniformly increasing weight throughout the entire webbing length, thus resolving the strength-weight contradiction.
Data Source
AI summary
A climbing quickdraw is defined by first and second carabiners interconnected by looped webbing that has been overlapped and stitched to define a central, interconnecting portion that has four layers, and carabiner openings that are double layered. The length of webbing is formed in a loop such that the webbing is doubled over on itself until the ends are almost even with each other but not overlapping. The loop is then pressed flat so that the splice is near the center of the flattened loop and the webbing is four layers thick. The webbing is then securely sewn through all four layers on both sides of the splice, leaving an open loop at each end for attaching a carabiner. The new quickdraw can be made from woven webbing or from braided webbing. Braided webbing can be made of stretchy, energy absorbing nylon, giving the quickdraw energy absorbing properties. The braided webbing will also have mechanical properties that will allow it to stretch and absorb energy.