Ascender One-Way Clutch Drive for Reverse Torque Protection
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Solution Overview
Problem
Existing ascenders using portable rotary power tools face damage due to excessive reverse rotational forces when the power tool is stopped during climbing, as these forces are transmitted to the tool's 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 to the rotary power tool, thereby protecting it from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the power tool is stopped during climbing, then the climbing operation can be paused, but excessive reverse rotational force is transmitted to the power tool causing damage
Solution Approach 1:
A one-way clutch mechanism is introduced as an intermediary between the pulley and the power tool input shaft. This clutch allows forward rotation to transmit driving force from the power tool to the rope, but prevents reverse rotation from transmitting load back to the power tool. The one-way clutch acts as a mediator that selectively transmits or blocks rotational force based on direction, thereby protecting the power tool while maintaining functional simplicity.
2Reliability
If a one-way clutch mechanism is added to prevent reverse rotation, then the power tool is protected from damage, but the device complexity increases
Solution Approach 1:
The ascender is divided into functionally independent segments: the power tool driving section, the one-way clutch section, the differential reduction drive section, and the rope winding section. This segmentation allows the one-way clutch to be integrated as a discrete component that can be independently selected and replaced, minimizing the impact of its complexity on the overall system. Each segment performs a specific function and can be optimized separately.
3Reliability
If the one-way clutch restricts reverse rotation, then reverse rotational force is prevented from reaching the power tool, but the descending operation becomes more complex
Solution Approach 1:
The one-way clutch automatically performs the function of protecting the power tool during both climbing and descending operations without requiring user intervention. During descending, when the rope is paid out, the reverse rotation naturally occurs and the one-way clutch automatically engages to prevent force transmission to the power tool. The system serves itself by using the natural direction of rotation during descending to activate the protective function, eliminating the need for additional controls or user actions.
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 effectively prevents damage to the rotary power tool by restricting reverse rotation, allowing safe operation and preventing damage during climbing and descending, while enabling efficient rope movement for ascending and descending.
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
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, reduces a forward rotational speed applied to the input shaft, and transmits the reduced forward rotational speed to the output shaft
Implementation Method 3
an output shaft coupled to a pulley allowing a rope to be wound... the rope is wound from an inlet side to an outlet side of the pulley of the ascender
Implementation Method 4
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
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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.