Tool Collet Securing Hand Tool to Lanyard
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Solution Overview
Problem
Existing lanyard attachment methods for hand tools, particularly on metal shafts like alignment pins and drift pins, fail to securely attach due to the lack of a 'shoulder' on the tool, causing the lanyard to slip off when arresting the fall, leading to potential damage or injury.
Innovation Solution
A tool collet with a collet body, lanyard ring, and fastening members, featuring an annular groove and gripping members like setscrews, securely attaches to the hand tool, ensuring the lanyard remains in place even under sudden force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If tape or heat shrink tubing is used to secure a D-ring webbing to a hand tool, then the attachment method is simple and easy to apply, but the lanyard can slip off when forces are exerted during tool arrest
Solution Approach 1:
The attachment system is divided into separate functional components: a collet body that provides the attachment interface, fastening members that secure the collet to the tool, and a lanyard ring that connects to the safety lanyard. This segmentation allows each component to be optimized for its specific function while working together as a reliable system.
Solution Approach 2:
The collet body is pre-formed with an annular groove that captures the lanyard ring before any forces are applied. The fastening members are designed to be installed and tightened in advance, creating a pre-loaded secure attachment that is ready to withstand arrest forces immediately when needed.
2Reliability
If a shoulder is added to the tool to prevent lanyard slippage, then attachment security is improved, but the tool design becomes more complex
Solution Approach 1:
The collet body acts as an intermediary device that bridges the gap between the existing tool design and the lanyard attachment requirement. Instead of modifying the tool itself, the collet provides the necessary shoulder and attachment interface as a separate component that can be applied to various tool types without changing their fundamental design.
Solution Approach 2:
The collet body design with its annular groove and fastening member interface is universal and can be adapted to different tool types and sizes. This multi-functional approach allows the same basic collet design to serve as the attachment point for various hand tools without requiring tool-specific modifications.
3Reliability
If the lanyard attachment point is positioned on a wider portion of the tool, then slippage is prevented, but the attachment point location is limited by tool geometry
Solution Approach 1:
The collet body serves as an intermediary that creates its own attachment geometry independent of the tool's existing shape. The annular groove in the collet provides a consistent shoulder for the lanyard ring regardless of whether the underlying tool has a tapered shaft, cylindrical body, or irregular geometry, thus enabling attachment at optimal locations on various tool types.
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 tool collet effectively prevents the lanyard from slipping off, providing a secure attachment point that withstands the forces exerted during tool arrest, thereby preventing accidents and damage.
Implementation Method 1
The one or more fastening members are adapted to securely fix the first body component to the second body component and the tool collet to the hand tool
Implementation Method 2
The gripping members frictionally engage the hand tool to prevent the tool collet from slipping off
Implementation Method 3
The annular groove captures the annular end of the lanyard ring to prevent it from detaching
Data Source
AI summary
A method of creating a shear across a fastener for a tool collet being attached to a hand tool includes providing a tool collet having a collet body with a peripheral body surface and a collet through opening where the collet body is divided into a first body component and a second body component attachable to each other and where one of the first body component and the second body component has a first radial through aperture extending from the peripheral body surface to the collet through opening, providing a setscrew within the first radial through aperture, inserting a hand tool into the collet through opening, securing the first body component to the second body component, and tightening the setscrew against the hand tool sufficient to cause the first body component and the second body component to slide in opposite directions transversely to the portion of the hand tool.