Modular Fid With Wire Basket for Rope Splicing
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Solution Overview
Problem
Existing fid tools for splicing high-tensile strength ropes lack a secure mechanism to attach the rope end, leading to inadequate retention during splicing operations, especially in high-tension applications like towing and winching.
Innovation Solution
A modular fid design comprising an elongate shaft with a conically pointed tip, a coupler with a threaded cavity, and a helically braided wire basket that can be compressed and attached to the shaft, providing a secure and adjustable mechanism to hold the rope in place.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional fid design with a long cylindrical shaft and conical tip is used, then the fid can separate rope strands for splicing, but the rope end cannot be securely attached to the fid
Solution Approach 1:
The fid is divided into separate components: a shaft with conical tip, a coupler, and a rope attachment assembly with wire basket. These modular segments can be assembled and disassembled independently, providing secure rope retention while maintaining manageable device complexity through functional separation.
Solution Approach 2:
The wire basket is nested within the coupler assembly, which in turn attaches to the shaft. This nested configuration allows the rope attachment mechanism to be compactly integrated into the fid structure, securing the rope end reliably without excessive external complexity.
2Reliability
If tape is used to attach the rope to the fid, then the fid can be simple in design, but the attachment is not secure enough to resist splicing stress
Solution Approach 1:
The attachment mechanism transitions from a simple tape connection to a threaded mechanical connection using a coupler with internal threads and a rope holder with external threads. This parameter change in connection type provides secure attachment capable of resisting splicing stress while remaining manufacturable through standard threading operations.
3Reliability
If a threaded bore is used to hold the rope end, then the fid can provide mechanical retention, but the threads may not provide adequate retention force under high tension
Solution Approach 1:
The rope holder uses a dynamic compression mechanism where the wire basket can be compressed radially to grip the rope end securely. This dynamic adjustment capability allows the connection structure to provide adequate retention force under high tension while maintaining a relatively simple overall design through functional specialization.
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 modular design allows for easy assembly and disassembly, secure retention of the rope during splicing, and efficient creation of rope eyes suitable for high-tensile applications, enhancing the strength and reliability of the splice under tension.
Implementation Method 1
A fid is a tool used to hold open knots and holes in canvas, and to separate the 'lays' or strands of synthetic or natural rope for splicing
Implementation Method 2
The end portion may be solid with threading as for a bolt formed in the outside surface thereof. Alternatively, the end portion may be hollow with threading on an interior cylindrical surface defining the hollow area.
Implementation Method 3
In other embodiments, the wire basket may be adhered within the cavity in the second end of the coupler or otherwise connected or retained therein
Implementation Method 4
The third component may take the form of a cylindrical, helically wound braid of thin wire cable or other similar flexible cable material forming a wire basket
Data Source
AI summary
A fid is made of separate components that can be easily assembled and disassembled by the user. In this manner the fid components can be easily stored or transported and then assembled when needed to create a fid of sufficient length to splice a synthetic rope or other types of rope. The fid includes an elongate shaft or needle with a first that tapers to a point. The opposing end of the shaft may be machined to form a connection structure. A coupler may have an elongate form with two opposing ends along a center axis. One end of the coupler removable attaches to the needle at the connection structure. The second end of the coupler permanently attaches to a rope holder, which may take the form of a cylindrical, helically wound braid of thin wire cable forming a wire basket.