One-Piece Strap Adjustor Friction Design
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Solution Overview
Problem
Conventional one-piece strap adjustors fail to prevent slippage of straps when tension is reduced, leading to a need for constant adjustment to maintain a secure fit, especially in applications like helmets and protective gear.
Innovation Solution
A one-piece strap adjustor design featuring a textured surface bar and strategically angled openings that compress the strap to prevent slippage, with the second opening intersecting the third opening to create a void where the strap changes direction, enhancing friction and resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a conventional one-piece strap adjustor with through-openings is used, then the strap can be easily threaded and adjusted, but the strap slips when tension is reduced requiring constant readjustment
Solution Approach 1:
The adjustor is divided into multiple functional zones: a first opening for threading, a second opening for strap passage, and a textured surface bar that segments the strap path to create friction zones. This segmentation allows the strap to be easily threaded while maintaining position through distributed friction points along its path.
Solution Approach 2:
The textured surface bar provides localized high-friction contact points at specific locations along the strap path. Rather than making the entire adjustor surface textured, only the bar contacts the strap with increased friction, maintaining ease of threading while preventing slippage at critical positions.
2Adaptability or versatility
If the opening height is increased to accommodate thicker straps, then thicker straps can be used, but the compressive force on the strap is reduced allowing slippage
Solution Approach 1:
Instead of relying solely on vertical compression from opening height, the invention adds a horizontal friction dimension through the textured surface bar. The bar contacts the strap laterally, providing friction-based retention that works complementarily with the vertical compression, allowing thicker straps to be retained without reducing opening height.
Solution Approach 2:
The adjustor combines smooth surfaces (for easy threading) with textured surfaces (for friction-based retention). This composite surface approach allows the same structure to accommodate different strap thicknesses while maintaining both ease of operation and slippage prevention through different surface properties at different locations.
3Reliability
If a textured surface is added to increase friction, then strap slippage is reduced, but manufacturing complexity increases
Solution Approach 1:
The textured surface is segmented into a specific bar region rather than covering the entire adjustor. This localized texturing can be manufactured more efficiently using techniques like injection molding with textured inserts or post-manufacturing texturing of only the necessary bar surface, reducing overall manufacturing complexity while maintaining slippage prevention.
Solution Approach 2:
Only the bar surface that contacts the strap is textured, while other surfaces remain smooth. This localized application of texture minimizes the amount of complex manufacturing required, as the textured bar can be produced as a separate component or through targeted surface treatment of an otherwise simple one-piece structure.
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 design effectively minimizes slippage and relative movement between the straps and the adjustor, even when tension is not applied, ensuring a secure and consistent fit without frequent readjustment.
Implementation Method 1
The bar can comprise a textured surface to increase friction or resistance between the bar and the at least one strap
Implementation Method 2
The strap adjustor can be formed so that the third opening compresses the at least one strap to prevent the at least one strap from slipping through the third opening when tension is reduced along a length of the at least one strap
Implementation Method 3
The second opening can intersect with the third opening to provide a void into which the at least one strap can be disposed, and the at least one strap can change directions within the void before exiting the void through the third opening
Data Source
AI summary
A strap adjustor can comprise a first surface, a second surface opposite the first surface, a third surface that extends between the first surface and the second surface. A first opening in the first surface can extend completely through the strap adjustor between the first surface and the second surface. A second opening in the first surface can extend partially but not completely through the strap adjustor. A bar can be disposed at the first surface between the first opening and the second opening. A third opening in the third surface can extends partially but not completely through the strap adjustor and join with the second opening. At least one strap can be disposed partially through the third opening, and the at least one strap can comprise an uncompressed thickness that is greater than a height of the third opening.