Rope Attachment Retainer for Fast Pre-Formed Friction Grip
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Solution Overview
Problem
The prusik knot requires substantial dressing and skill to form a friction fit with a specific rope diameter, is not suitable for pre-forming, and needs re-dressing each time it is used, making it time-consuming and unsuitable for quick attachment points.
Innovation Solution
A device with a loop arrangement and retainer that allows for easy attachment to a rope or structure, featuring a movable retainer that adjusts the loop sizes and maintains a furled condition, providing a secure attachment point with minimal effort and no need for re-dressing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a prusik knot is used to form an attachment point, then the attachment point can be formed on a rope, but substantial dressing and skill are required and it needs re-dressing each time it is used
Solution Approach 1:
The loop arrangement is pre-formed with the second loop portion and retainer already in position, eliminating the need for dressing during use. The device can be manufactured and prepared in advance, then simply attached to the rope by threading and tightening, saving significant time and skill requirements during actual use.
Solution Approach 2:
The attachment device is divided into separate functional components: the loop arrangement (with first and second loop portions), the retainer, and the gripping portion. This segmentation allows the complex knot-tying operation to be replaced by simpler assembly steps of positioning and securing the pre-formed components.
2Adaptability or versatility
If a prusik knot is used to form an attachment point, then the attachment point can be formed on a rope, but it requires substantial skill to size the knot for a friction fit with a particular diameter of main rope
Solution Approach 1:
The retainer is designed with adjustable positioning along the second loop portion, allowing the size of the wrapped section to be varied. This enables the device to adapt to different rope diameters by changing the geometric parameter of the loop arrangement, specifically the diameter of the wrapped section around the rope.
Solution Approach 2:
The loop arrangement with adjustable retainer positioning can accommodate multiple rope diameters and different application scenarios. The same device structure serves multiple functions by adjusting the retainer position, eliminating the need for multiple specialized knots for different rope sizes.
3Productivity
If a prusik knot is used to form an attachment point, then the attachment point can be formed on a rope, but it is not suitable to be pre-formed and requires time and skill to create the correctly size knot each time
Solution Approach 1:
The loop arrangement is pre-formed as a complete assembly including the first loop portion, second loop portion, and retainer. This preliminary preparation transforms the complex knot-tying process into a simple threading and tightening operation, dramatically increasing productivity while reducing the perceived complexity during actual use.
Solution Approach 2:
The device creates a standardized, repeatable attachment configuration that can be consistently reproduced without requiring skillful manipulation. Each use copies the same geometric arrangement of loops and retainer positioning, ensuring consistent performance and eliminating variability associated with manual knot tying.
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 device simplifies the attachment process, ensuring a secure and adjustable attachment point that can be pre-formed, reducing the need for constant re-dressing and requiring minimal skill, while maintaining a stable grip on the rope even when unloaded.
Implementation Method 1
The gripping portion is slidable along the main rope and grips the main rope, via friction, when the attachment portion is tensioned.
Data Source
AI summary
A device for attachment with a structure such as a rope, bar, cord, pole or the like includes a loop arrangement having a first attachment portion and a second loop portion and a retainer located between the first attachment portion and the second loop portion. The loop arrangement is adapted to be movable between a non-furled condition, in which respective first and second ends of the first attachment portion and the second loop portion are located away from one another, and a furled condition, in which the second loop portion is wrapped around the rope to form a wrapped section with the first attachment portion fitted through the second loop portion and extending laterally of the rope and with the second end of the second loop portion being retained by the retainer thereby maintaining the furled condition. A retainer and an associated method of use is also disclosed.