Adjustable Lanyard with Prusik Knot for Secure Attachment
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Solution Overview
Problem
Existing attachment methods, such as bungee cords, are flimsy, lack elastic rigidity, and cannot be easily adjusted to customize the length for specific applications, posing a risk in high-risk situations like military operations where equipment needs secure and customizable attachment.
Innovation Solution
The development of dual loop lanyards with adjustable loops, utilizing a Prusik knot or similar friction hitch, allowing for customizable length adjustment by varying the diameter of one or both loops, ensuring secure attachment to equipment, personnel, and modes of transportation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If bungee cords are used for attachment, then easy attachment and removal is achieved, but the cord lacks elastic rigidity and may easily detach
Solution Approach 1:
The lanyard incorporates a dynamic adjustment mechanism using a Prusik knot that allows the length to be adjusted while maintaining secure attachment. The friction hitch enables the cord to be dynamically repositioned and locked at desired lengths, providing both ease of adjustment and reliable attachment under load.
2Adaptability or versatility
If bungee cords are used, then flexibility is provided, but the ability to adjust length to desired length is lost
Solution Approach 1:
The Prusik knot functions as a self-adjusting mechanism where the user can easily slide the friction hitch along the main cord to adjust the length, and the knot automatically locks into position under its own weight and tension, providing self-service length adjustment without requiring tools or complex mechanisms.
3Strength
If ropes are used for fixed length applications, then structural integrity is maintained, but length adjustment requires significant untying and retying of knots
Solution Approach 1:
The invention replaces the traditional mechanical system of tying and untying knots with a friction-based hitch system. The Prusik knot uses friction between the cord and itself to create an adjustable, lockable mechanism that maintains structural integrity while allowing rapid length adjustment without untying any knots.
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 adjustable lanyards provide enhanced control and customization for attaching equipment, preventing unintended detachment and offering a secure, adjustable solution for various attachment needs, particularly in high-risk environments.
Implementation Method 1
the lanyard may include a Prusik knot (or other related type of friction hitch), such that the diameter of at least one of the two loops is adjustable
Data Source
AI summary
A lanyard device includes a first attachment loop, a central portion, and a second attachment loop. Each of the first attachment loop and the second attachment loop is coupled to the central portion. The first attachment loop has a fixed diameter. The second attachment loop has an adjustable diameter. In an embodiment, the second attachment loop terminates at an adjustment feature, which is coupled to the central portion. For example, the adjustment feature may be a Prusik knot.