Hoisting Rope End Fastening with Spiral Groove Friction Lock
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Solution Overview
Problem
Existing methods for fastening hoisting ropes to hoisting devices are inadequate for ropes made of materials other than steel, limiting the flexibility in material selection based on usage.
Innovation Solution
A hoisting device with a rope drum and a fastening device featuring a spiral groove and locking arrangement, allowing for the use of various materials, including synthetic ropes like Dyneema, with detachable and rotating fastening for adaptability and enhanced friction for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional fastening methods (wedge pockets and rope tighteners) are used, then steel ropes can be securely fastened, but material selection is limited and synthetic ropes cannot be effectively utilized
Solution Approach 1:
The patent changes the fundamental fastening mechanism from mechanical interlocking (wedges, tighteners) to friction-based attachment. By using a spiral groove that creates friction with the rope surface, the system can accommodate different rope materials (steel, synthetic, Dyneema) while maintaining secure fastening. The friction parameter is controlled by the groove geometry and material contact pressure.
Solution Approach 2:
The fastening device with spiral groove serves multiple functions: it secures the rope end, prevents unraveling, and accommodates various rope materials and diameters. The same basic structure works with steel ropes, synthetic ropes, and high-performance fibers like Dyneema, making the hoisting device universally applicable to different rope types.
2Adaptability or versatility
If friction-based fastening is used to enable diverse material selection, then material versatility improves, but the complexity of the fastening device increases
Solution Approach 1:
The spiral groove introduces a curved, helical geometry to the fastening surface. This curved structure naturally generates friction and normal force against the rope as it winds around the grooved portion, enabling secure attachment without complex mechanical components. The spiral form converts linear rope tension into radial pressure, simplifying the overall device structure.
Solution Approach 2:
The fastening device uses simple, easily manufactured components including a grooved block or attachment point. Rather than complex adjustable mechanisms, the solution employs a straightforward spiral groove that can be molded or machined into the fastening component, reducing manufacturing complexity and cost.
3Adaptability or versatility
If a spiral groove fastening system is used, then various rope materials can be secured through friction, but the design complexity of the fastening arrangement increases
Solution Approach 1:
The spiral groove creates a helical friction surface that naturally adapts to different rope diameters and materials. The curved geometry provides continuous contact and friction along the rope length, securing various materials without requiring complex adjustment mechanisms or multiple fastening components.
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
Enables the use of diverse materials for hoisting ropes by utilizing friction-based fastening, ensuring secure attachment and adaptability to different loads and motions, thereby enhancing the versatility of hoisting operations.
Implementation Method 1
With such a solution it is possible to utilize friction to fasten the hoisting rope
Data Source
AI summary
A hoisting device includes a body, a hoisting rope, a rope drum arranged in connection with the body, on which a first end of the hoisting rope is fastened, and a hoisting part which ascends and descends by means of the hoisting rope. The hoisting device includes a fastening device of a second end of the hoisting rope, which is formed into a loop wherein a spiral groove is substantially surrounding the entire loop and in which the part adjacent to the second end of the hoisting rope is received. The hoisting device further has a fastening arrangement which locks the second end of the hoisting rope to the fastening device, preventing the second end from being pulled out of the fastening device.