Ascender One-Way Clutch for Reverse Torque Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing ascenders using rotary power tools face damage due to reverse rotational forces when the power tool is stopped during climbing, as these forces are transmitted back to the tool, causing damage to the internal structure.
Innovation Solution
Incorporating a differential reduction drive with a one-way clutch mechanism that allows forward rotation while preventing reverse rotation, ensuring that reverse rotational forces generated during climbing are not transmitted back to the rotary power tool, thereby protecting it from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power tool is coupled to the input shaft during climbing, then climbing function is enabled, but reverse rotational force damages the power tool when operation stops
Solution Approach 1:
A one-way clutch mechanism is introduced as an intermediary between the power tool and the pulley system. This clutch allows rotational force to be transmitted from the power tool to the pulley during climbing, but automatically disengages to prevent reverse rotational force from reaching the power tool when operation stops, thus protecting the tool while managing complexity through a standardized mechanical component
Solution Approach 2:
The rotational force transmission path is segmented into two independent directions: forward rotation (climbing) and reverse rotation (descent/protection). The one-way clutch divides the unified transmission system into directionally independent segments, allowing the power tool to be protected from reverse forces while still enabling controlled descent through the same mechanical pathway
2Ease of operation
If the pulley rotates reversely for descent, then controlled descent is enabled, but reverse rotational force is transmitted to the power tool causing damage
Solution Approach 1:
The one-way clutch acts as a selective intermediary that permits reverse rotation of the pulley for controlled descent while blocking the transmission of reverse rotational force to the power tool. This allows the descent function to operate independently of the power tool, eliminating the harmful reverse force transmission while maintaining ease of operation
Solution Approach 2:
The clutch mechanism dynamically changes its engagement state based on rotation direction: engaged during forward rotation to transmit power for climbing, and disengaged during reverse rotation to allow pulley movement for descent while protecting the power tool. This dynamic behavior enables both climbing and descent functions without compromising power tool integrity
3Reliability
If the one-way clutch portion is restricted from rotating, then forward rotation is allowed and reverse rotation is prevented, but the clutch portion itself cannot rotate to accommodate descent
Solution Approach 1:
The one-way clutch is designed with dynamic rotational characteristics: it restricts rotation in the reverse direction to prevent damage, but allows free rotation in the forward direction for climbing and controlled slippage during descent. This dynamic adaptability enables the system to maintain reliability while accommodating different operational requirements
Solution Approach 2:
The clutch's rotational freedom is segmented by direction: restricted in the reverse direction to protect the power tool, and permitted in the forward direction to enable climbing and controlled descent. This directional segmentation provides both protection and operational versatility without requiring complex additional mechanisms
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
This solution enables safe and damage-free operation by allowing forward climbing and controlled descent without transmitting reverse rotational forces to the power tool, ensuring the ascender's components remain undamaged.
Implementation Method 1
The input shaft of the ascender is provided with a one-way clutch portion that allows a forward rotation and prevents a reverse rotation
Implementation Method 2
an ascender including a differential reduction drive that includes an input shaft configured to be driven by a rotary power tool and an output shaft coupled to a pulley allowing a rope to be wound
Implementation Method 3
allowing the pulley and the reduction drive to rotate reversely by a tension generated in an inlet-side rope to which the weight of the user is applied
Data Source
AI summary
A method for climbing and descending using an ascender including a differential reduction drive that includes an input shaft driven by a rotary power tool and an output shaft coupled to a pulley allowing a rope to be wound, reduces a forward rotational speed applied to the input shaft, and transmits the reduced forward rotational speed to the output shaft. The input shaft of the ascender is provided with a one-way clutch portion that allows a forward rotation and prevents a reverse rotation. The forward rotation of the pulley is performed by restricting rotation of the one-way clutch portion about the input shaft and driving the input shaft to rotate forward in a climbing direction by the rotary power tool. The reverse rotation of the pulley is performed by releasing the rotation restriction of the one-way clutch portion about the input shaft.