Self-tailing Winch Release Mechanism for Rope Wear Reduction
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Solution Overview
Problem
Self-tailing winches face difficulties in smoothly releasing rope tension without causing excessive wear, as existing mechanisms either lead to uneven wear patterns or require manual handling of significant tension, making it challenging to control the feed-out of rope safely and efficiently.
Innovation Solution
A self-tailing winch with a release function that includes a stator body, a rotatable drum, and self-tailing jaws with a releasable coupling mechanism, allowing the jaws to rotate independently of the drum, controlled by a self-tailing cover with cams and locking pins or balls, which gradually reduces friction and tension when manipulated, preventing wear and enabling easy rope feed-out.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the jaws are fixed and connected to the drum to maintain tension, then tension consistency is improved, but rope wear increases due to friction during rope feed-out
Solution Approach 1:
The patent applies the dynamics principle by making the jaw assembly rotatable relative to the drum through a releasable coupling mechanism. When the release function is activated, the jaws can rotate independently to reduce friction and wear on the rope during feed-out, while maintaining tension consistency. This dynamic adjustment allows the system to adapt between fixed (for tension) and rotating (for reduced wear) states.
2Ease of operation
If a release mechanism is incorporated to enable controlled rope feed-out, then ease of operation is improved, but device complexity increases
Solution Approach 1:
The self-tailing cover serves multiple functions: it covers the self-tailing jaws, provides a grip for operating the winch, and acts as the release mechanism to rotate the jaw assembly relative to the drum. By integrating these functions into a single component, the patent reduces overall device complexity while maintaining ease of operation for rope feed-out control.
3Reliability
If the jaws compress the rope axially to increase holding power, then reliability is improved, but rope wear increases during tensioning
Solution Approach 1:
The patent applies dynamics by enabling the jaw assembly to rotate relative to the drum when the release function is activated. This rotation reduces static friction and wear on the rope during feed-out operations, while the axial compression of the jaws is maintained during tensioning to ensure reliable holding power. The system dynamically adjusts between these two states as needed.
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 allows for controlled and safe release of rope tension, reducing wear and tear on the rope, enabling single-person operation, and maintaining tension consistency, thus extending the lifespan of sailboat sheets by distributing wear evenly.
Implementation Method 1
the self-tailing jaws are urged towards each other by resilient means and able to engage a rope
Implementation Method 2
the self-tailing cover is provided with radially extending cams said cams having a varying radial curvature with respect to the rotation axis, and where the cams by rotating the self-tailing cover into a first position can urge the engaging pins radially outward and into the indentations
Implementation Method 3
the jaws are able to grip the rope and thereby resist letting out rope while tension is applied to the other end of the rope
Data Source
Figure 1~2
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Figure 5
AI summary
Self-tailing winch with a release function, where said winch comprises: - a stator body adapted to be fastened on a surface; - a drum body arranged concentrically and rotatable around said stator body; - a self-tailing device arranged concentrically to said drum body, where said self-tailing device comprises: - two self-tailing jaws defining an opening suitable to receive a rope, sheet or halyard; - a self-tailing cover which is rotatable relative to the drum body and the self-tailing jaws; - a releasable coupling arranged between the self-tailing cover and the self-tailing jaws, said coupling being able to couple the self-tailing jaws to the drum body and by manipulating the self-tailing cover completely releasing the self-tailing jaws from their engagement with the drum body, allowing the self-tailing jaws to rotate relative to the drum.