Powered Ascender Descent Assist Friction Device
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Solution Overview
Problem
Powered rope ascenders often cause damage to ropes during descent with heavy loads due to mechanical wear, especially on smaller diameter ropes, as they lack sufficient protection against abrasion, leading to sub-optimal performance compared to purpose-built devices for lowering.
Innovation Solution
A friction increasing descent assist device is integrated into the powered rope ascender, featuring multiple guide surfaces and a capstan peg to provide a controlled frictional drag force, allowing the rope to wrap angularly and resist motion, thereby reducing mechanical wear and damage during descent.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a powered ascender uses a climbing mechanism to descend a rope with a heavy load, then the ascender can lower the load along the rope, but the climbing mechanism imparts mechanical wear and damage to the rope
Solution Approach 1:
The descent function is segmented from the climbing mechanism. A separate friction increasing descent assist device is integrated into the powered ascender, featuring multiple guide surfaces and a capstan peg that independently handle the rope during descent, while the climbing mechanism focuses on ascending operations.
Solution Approach 2:
The friction increasing descent assist device acts as an intermediary between the rope and the powered ascender body. It provides a dedicated interface with multiple guide surfaces and capstan pegs that control rope motion and generate frictional drag force, preventing direct damaging contact between the rope and the climbing mechanism.
2Power
If the climbing mechanism is designed for effective climbing, then it can lift heavy loads efficiently, but it provides sub-optimal results when descending, especially on smaller diameter ropes
Solution Approach 1:
The powered ascender achieves multi-functionality by integrating both climbing and descent capabilities. The climbing mechanism maintains its optimized design for ascending operations, while the friction increasing descent assist device provides specialized functionality for descending, allowing the system to perform both functions effectively regardless of rope diameter.
Solution Approach 2:
Different parts of the powered ascender have specialized properties optimized for their specific functions. The climbing mechanism features components optimized for gripping and lifting, while the descent assist device features multiple guide surfaces and capstan pegs with high-friction characteristics specifically for controlled descent and rope protection.
3Adaptability or versatility
If the ascender descends on smaller diameter ropes (e.g., 7 mm), then it can access more locations, but the thinner sheath provides reduced protection against abrasion from the climbing mechanism
Solution Approach 1:
The friction increasing descent assist device converts the potentially harmful abrasion from direct climbing mechanism contact into a beneficial controlled frictional drag force. The multiple guide surfaces and capstan pegs distribute the mechanical stress and generate friction that protects the rope, especially valuable on smaller diameter ropes with thinner sheaths.
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 minimizes rope damage and enhances the powered ascender's ability to descend ropes of various diameters by distributing the load and reducing mechanical stress, ensuring efficient and damage-free operation.
Implementation Method 1
A friction increasing descent assist device is provided on the powered rope ascender. The friction increasing descent assist device is configured to provide a rope path having at least three guide surfaces around which the rope wraps angularly... The friction increasing descent assist device enhances operation of the powered rope ascender when operating in the descending mode.
Implementation Method 2
The friction increasing descent assist device is configured to provide a rope path having at least three guide surfaces around which the rope wraps angularly including a first, superior guide surface, a second laterally spaced capstan guide surface, and a third inferior guide surface.
Data Source
Figure 1
Figure 2
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AI summary
A descent assist device for powered ascenders is discussed herein. In one embodiment, the descent assist device can include a base plate having a first guide surface, a capstan, peg, a second guide surface, and a retention loop extending from the first guide surface to the second guide surface configured to retain a rope on the descent assist device. Where the angle of wrapping of the rope around the first guide surface and the capstan peg is constant during use and the angle of wrapping of the rope around the second guide surface is adjustable by the user of the device to increase or decrease die frictional drag of the rope.