Asymmetric Diving Mask Strap for Occipital Fit
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Solution Overview
Problem
Conventional diving face mask straps fail to provide a secure fit at the occipital region due to mismatched circumferential lengths of their branched sub-sections, leading to slacking and discomfort.
Innovation Solution
A strap with a loop section featuring an upper branched sub-section with a larger circumferential length than the lower, designed to match the head's curvature, with sloping halves and concave inner curvature, and elastic stretchability to ensure a stable and snug fit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the upper and lower branched sub-sections are made symmetric with equal circumferential lengths, then the manufacturing is simplified and the structure is easier to produce, but the fit to the occipital region becomes poor due to the three-dimensional curvature of the head
Solution Approach 1:
The patent applies asymmetry by making the upper branched sub-section longer than the lower branched sub-section. This asymmetric design matches the three-dimensional curvature of the occipital region, where the upper portion has a longer circumferential path than the lower portion, thereby achieving better fit precision without complicating the manufacturing process
Solution Approach 2:
The patent applies local quality by differentiating the circumferential lengths of the upper and lower branched sub-sections according to the specific requirements of different regions of the occipital head. The upper sub-section is made longer to accommodate the longer circumferential path in the upper region, while the lower sub-section is shorter for the lower region, optimizing the fit for each local area
2Manufacturing precision
If the strap is adjusted by pulling down the lateral sections to improve fit, then the fit may be temporarily improved, but the stability and comfort are reduced due to slacking and redundancy in the lower branched sub-section
Solution Approach 1:
The asymmetric design with a longer upper branched sub-section eliminates slacking and redundancy in the lower section, distributing tension evenly across both sub-sections. This prevents the lower section from becoming loose while maintaining proper fit, thereby improving both fit precision and stability simultaneously
Solution Approach 2:
The patent changes the key parameter of circumferential length for the upper and lower branched sub-sections to match the three-dimensional curvature of the occipital region. By optimizing this parameter, the strap achieves both accurate fit and stable tension distribution without requiring manual adjustment
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 strap achieves improved stability and fit on the wearer's head by matching the head's curvature, reducing slacking and enhancing comfort through equalized tension and close contact with the occipital region.
Implementation Method 1
The strap is elastically stretchable at least lengthwise of lengthwise and widthwise
Data Source
AI summary
A strap for diving face mask includes an upper branched sub-section and a lower branched sub-section forming together a loop section in a middle zone of the strap as viewed lengthwise. The upper branched sub-section has a circumferential length larger than a circumferential length of the lower branched sub-section and preferably right and left halves of the strap are sloped toward the side of the lower branched sub-section.