Unitary Insulating Line Strainer for Electric Fence Tensioning
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Solution Overview
Problem
The installation and maintenance of electric fencing networks are labor-intensive due to the need for taut wire and insulators to prevent short circuits, with existing solutions prone to voids and stress cracks that can lead to electrical breakdown and tracking issues.
Innovation Solution
A line strainer with a unitary body made of electrically non-conductive material, featuring a spool with toothed flanges and a releasable pawl, and a line bearing support member to secure and tension electric fence lines, reducing the likelihood of voids and stress cracks through improved structural integrity and increased tracking distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a conductive frame with metal pins is used to secure the insulator, then the installation complexity is reduced, but the risk of electrical breakdown and tracking increases due to voids and stress cracks
Solution Approach 1:
The patent combines the insulator and frame into a single unitary insulating body structure, eliminating the separate metal pins and multiple-component assembly. This merging removes the interfaces between metal and insulating materials, thereby eliminating voids and stress crack formation while maintaining installation simplicity.
Solution Approach 2:
The patent employs a unitary insulating body made from composite material (such as glass-filled nylon) that provides both structural strength and electrical insulation properties. This composite material approach replaces the need for metal fasteners while maintaining mechanical integrity and electrical reliability.
2Reliability
If the distance between wire connection point and metal frame is increased to prevent tracking, then electrical breakdown risk is reduced, but the insulator size and likelihood of voids increase
Solution Approach 1:
The patent extracts the metal frame component entirely from the design, replacing it with a unitary insulating body. This elimination of the metal frame removes the need for large clearance distances, as the entire structure is insulating and cannot conduct electricity to create tracking paths.
Solution Approach 2:
The patent changes the material parameter of the frame from conductive metal to insulating material, fundamentally altering the electrical properties of the structure. This parameter change allows for reduced dimensions while maintaining electrical breakdown resistance.
3Strength
If steel frame is used for ratchet mechanism to achieve strength, then structural strength is improved, but electrical conductivity increases causing short circuit risk
Solution Approach 1:
The patent uses glass-filled nylon composite material for the unitary body, which provides both the required structural strength to handle wire tension and inherent electrical insulation properties. This composite material simultaneously satisfies both strength and insulation requirements that previously required separate metal and insulator components.
Solution Approach 2:
The patent merges the structural support function and electrical insulation function into a single unitary insulating body, eliminating the need for separate conductive frame and insulator components. This integration ensures that the structural elements themselves provide insulation.
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 simplifies the installation and maintenance of electric fencing by reducing labor requirements, minimizing the risk of electrical breakdown, and enhancing the structural integrity and insulation of the fence lines, while maintaining effective tensioning capabilities.
Implementation Method 1
a releasable pawl attached to the unitary body and configured to engage with the at least one toothed flange to restrict rotation of the spool in one direction
Data Source
AI summary
A line strainer for use in an electric fence system is described. The line strainer includes a unitary body made of electrically non-conductive material, having two opposing arms, a spool mounting element for rotatably mounting an electrically conductive spool having at least one toothed flange between the arms of the body, wherein the spool is configured to have a first line secured to it. The line strainer further includes a line bearing support member about which a second line is to be passed and tensioned. A releasable pawl is attached to the unitary body and configured to engage with the at least one toothed flange to restrict rotation of the spool in one direction when the spool is rotatably mounted to the spool mounting element.