Braided Hoisting Rope End Fastening With Coil Spring Friction Lock
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Solution Overview
Problem
Existing methods for securing a hoisting rope made of synthetic material to a lifting device often damage the rope, even if the fastening is reliable, and there is a need for a method that ensures secure fastening without causing damage.
Innovation Solution
A tubular fastening frame with a coil spring is used, where the hoisting rope is threaded over the coil spring's windings and around the tubular frame, relying on friction for secure locking, with optional spiral grooving or roughening to enhance the fastening surface area, and the coil spring can be fastened before or after the rope is threaded.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a wedge pocket is used to secure the hoisting rope, then the fastening is reliable, but the synthetic material rope is damaged
Solution Approach 1:
The patent introduces a wedgeless socket as an intermediary component that secures the rope through friction and compression without the need for traditional wedge pockets. The socket compresses the rope strands uniformly, creating a secure fastening without the concentrated stress points that cause damage in wedge-based systems.
Solution Approach 2:
The patent changes the fastening mechanism from mechanical interlocking (wedges) to friction-based compression. By adjusting parameters such as compression force distribution and contact surface area, the system achieves reliable fastening while distributing stress to prevent rope damage.
2Reliability
If friction is increased to secure the rope, then the fastening becomes more reliable, but the rope may be damaged due to concentrated force
Solution Approach 1:
The socket serves multiple functions: it provides friction-based securing, distributes compression forces uniformly across the rope strands, and protects the rope from damage. This multi-functional design achieves reliable fastening without compromising rope strength.
Solution Approach 2:
The patent transitions from point-contact or line-contact fastening to surface-contact fastening. By increasing the dimensional contact area between the socket and rope, the compression force is distributed across a larger surface, reducing stress concentration while maintaining friction-based security.
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 method securely fastens the hoisting rope without damaging it, distributing friction over a wide surface area, ensuring reliable locking and easy installation, with the coil spring providing sufficient frictional force to hold the rope in place under load.
Implementation Method 1
the hoisting rope stays locked in place mainly by way of friction
Data Source
AI summary
A device for securing an end of a braided hoisting rope to a lifting device includes a tubular fastening frame to be fixed to the lifting device; and a coil spring which is arranged to be installed and fastened over the tubular fastening frame. When the end of a hoisting rope is fastened in place, the hollow, or workable into hollow, end of the hoisting rope is threaded over the windings of the coil spring as the outer surface of the windings and into contact with, or to be brought into contact with the outer periphery of the tubular fastening frame. A method for securing an end of a braided hoisting rope to a lifting device is also disclosed.