Climbing Winch Adhesion Pulley Rope Jam Prevention
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Solution Overview
Problem
Existing winches with grooved pulleys face issues with jamming due to the upward extraction of ropes without longitudinal rigidity and require additional locking devices, especially when dealing with ropes rather than cables, and have limitations in height and lifting force.
Innovation Solution
A grip pulley winch design featuring a frame with an upper region for the tensioned rope and a lower region for the slack rope, incorporating an adhesion pulley with a guide and clamping pulley system that allows the rope to exit downwards, eliminating jams and providing controlled force locking without a separate locking device, with pulleys positioned for a significant winding angle to enhance lifting force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the rope is extracted upwards from the top of the winch, then the winch structure is simplified, but the rope jams due to lack of longitudinal rigidity
Solution Approach 1:
The patent inverts the conventional rope extraction direction by guiding the slack strand downwards from the lower region of the frame instead of upwards from the top. This reversal eliminates jamming issues caused by upward extraction of flexible ropes while maintaining structural efficiency.
2Reliability
If a blocking device is added to prevent rope slippage, then lifting reliability is improved, but device complexity increases
Solution Approach 1:
The clamping pulley system automatically generates the necessary blocking force through the tension of the lifting strand itself. The system is self-regulating, requiring no external locking mechanisms or additional blocking devices to prevent rope slippage during lifting operations.
3Force
If the guide pulley and clamping pulley are positioned close to the adhesion pulley, then the winding angle increases and lifting force is enhanced, but the space requirement is reduced
Solution Approach 1:
The patent optimizes the spatial arrangement by positioning the guide pulley and clamping pulley in close proximity to the adhesion pulley along the rope path, creating a compact configuration that achieves a large winding angle (at least 200°, preferably 280° or more) without increasing the overall winch volume.
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 winch enables seamless ascent and descent along unlimited-length ropes, prevents jamming, and provides sufficient lifting force without additional braking, ensuring secure operation and compact portability.
Implementation Method 1
an adhesion pulley mounted on the frame and comprising on its periphery a groove allowing traction (transmission of force/movement) of the lifting strand by adhesion
Implementation Method 2
a clamping pulley at the grip pulley outlet, close to the guide pulley, exerting pressure on the lifting strand in the direction of the grip pulley
Data Source
Figure 1
Figure 2
Figure 3~5
AI summary
Winch (10) having a traction sheave (14) for moving along a lifting strand (20), in particular a rope or a cable, comprising a frame (12); a drive sheave (14) with a single groove (16) mounted on said frame (12); a guide means able to guide the lifting strand under tension from the upper region of said frame (12) towards the lower region thereof, the guide means comprising, on the side of the lower region of said frame, a guide sheave (22) in the vicinity of the drive sheave (14) and transferring the tensioned lifting strand (20a) to the drive sheave (14); a clamping sheave (26), in the vicinity of said guide sheave (22), that exerts a pressure on the lifting strand in the direction of said drive sheave (14) and acts at the wound end of the lifting strand (20) on said sheave (14) on the side of the free strand (20b).