Clamshell Line Float Assembly to Prevent Slip Without Knots
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Solution Overview
Problem
Existing line floats require axial passage through a through bore, which is time-consuming, weakens the line with knots, and allows longitudinal motion, making them difficult to install and prone to waterlogging.
Innovation Solution
A clamshell float design with two identical halves that snap together around the line, featuring interlocking tabs and grooves, teeth for line engagement, and a foam core for buoyancy, allowing easy installation and preventing longitudinal translation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a through bore is used to pass the line through the float, then the float can be attached to the line, but the line must be passed axially through which is time-consuming and requires knots that weaken the line
Solution Approach 1:
The float is divided into two separate halves that can be attached to the line independently and then joined together. This segmentation allows the line to be threaded through the foam core without requiring axial passage through a through bore, eliminating the need for time-consuming knot-tying operations and allowing parallel installation processes
Solution Approach 2:
The line is nested within the foam core of the float halves during assembly, allowing the line to be positioned and secured without passing through the outer shell. This nesting approach enables the line to be integrated into the float structure during manufacturing without requiring post-assembly knot-tying operations
2Stability of the object's composition
If knots are provided on the line to prevent longitudinal motion of the float, then the float position is secured, but the line strength is reduced and installation requires specialty expertise
Solution Approach 1:
The mechanical knot-tying system is replaced with a molded engagement system where protrusions on the float halves mechanically engage with the line or each other to prevent longitudinal motion. This substitution eliminates the need for knots while maintaining line strength and reducing installation complexity to standard manufacturing processes
Solution Approach 2:
The float halves are pre-formed with engagement features (protrusions, recesses, or integrated line holders) during the molding process, so that when assembled, the line is automatically secured without requiring field installation of knots. This preliminary action transfers the securing function from the installation phase to the manufacturing phase
3Ease of manufacture
If the float is made as a single piece, then manufacturing is simpler, but the float cannot be easily attached to lines with specialty configurations
Solution Approach 1:
The float is segmented into two halves that can be assembled around lines with various configurations (eyes, loops, hooks, pre-tied knots). This segmentation provides adaptability to accommodate specialty line configurations that would be incompatible with a single-piece through-bore design, while the halves can be joined using standard molding and assembly processes
Solution Approach 2:
The two-half float design creates a universal mounting system that can accommodate multiple line configurations and attachment methods. The open assembly structure allows the float to be installed on lines with eyes, loops, hooks, or pre-tied knots, making it universally compatible while maintaining manufacturing simplicity through standardized half-float components
4Force
If the float material is less dense than water, then the float provides buoyancy, but the float can become waterlogged over time
Solution Approach 1:
The float utilizes the foam core as a flexible, closed-cell structure that inherently resists water absorption. The foam material provides buoyancy while its cellular structure prevents waterlogging, and the shell integration seals the foam to further protect against water intrusion, maintaining reliability in marine environments
Solution Approach 2:
The float employs a composite construction combining foam core material (for buoyancy and water resistance) with a shell material (for structural integrity and environmental protection). This composite approach allows the buoyant foam to be protected from water absorption while maintaining the necessary mechanical properties for marine application
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 clamshell float design simplifies installation, maintains line strength, resists waterlogging, and ensures the float remains in a desired position without knots, enhancing visibility and durability.
Implementation Method 1
The buoy/float thus has a somewhat clamshell configuration with the line passing therethrough
Data Source
AI summary
Two half shells joined together to form a float. A line can be routed along a line pathway, such as along a centerline, and be captured between the two half shells. An interior wall has a notch therein and end walls have portals therein which allow a line to pass along the line pathway of the two half shells which are joined together to form the float. Teeth in the notch engage the line sufficient to keep the line from translating along the centerline. Multiple foam core pieces can reside within hollow interiors of the half shells to provide robust buoyancy to the float. In various embodiments, tabs and grooves along seam edges of the half shells fit together, with the half shells being identical in form and to provide a secure seam between the two half shells. Clips fit into slots to secure the two half shells together.