Fixed-Anchor Helmet Chin Strap for Single-Point Adjustment
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Solution Overview
Problem
Conventional helmet chin straps are difficult to adjust properly, often resulting in improper fitting that compromises safety, leading to potential head trauma and discomfort, as users frequently wear helmets with straps that are uneven, too loose, or unbuckled during dangerous activities.
Innovation Solution
A helmet design featuring a semi-rigid chin strap with fixed connections to the shell, allowing for easy adjustment through mechanisms like twist adjustment knobs, cable-type adjusters, or ratchet-style buckles, ensuring the strap remains intact and securely positioned without requiring symmetrical adjustment on both sides of the user's ears.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional flexible webbing straps with buckles are used for chin straps, then the helmet can be adjusted to fit different head sizes, but the adjustment process becomes complex and difficult to use properly
Solution Approach 1:
The chin strap is divided into multiple segments: a fixed end portion connected to the helmet shell, an adjustable intermediate portion with adjustment mechanism, and a free end portion. This segmentation allows the strap to accommodate different head sizes while simplifying the adjustment process to a single location.
Solution Approach 2:
An adjustment mechanism (such as a dial, cable system, or ratchet) is introduced as an intermediary device between the two ends of the chin strap. This intermediary component enables easy length adjustment through simple user input (turning a dial or pulling a cable) rather than complex manual manipulation of the entire strap.
2Reliability
If the chin strap is made tight to ensure proper fit and safety, then helmet stability improves, but user comfort decreases
Solution Approach 1:
The chin strap system allows dynamic adjustment of the tightness parameter based on user needs. Users can tighten the strap for high-risk activities requiring maximum stability, or loosen it for comfort during low-risk periods, thereby optimizing both safety and comfort across different conditions.
3Manufacturing precision
If multiple adjustment points are provided on both sides of the helmet, then symmetrical adjustment is possible, but the adjustment process becomes more time-consuming and complex
Solution Approach 1:
The adjustment functions for both sides of the chin strap are merged into a single adjustment mechanism. When the user adjusts the intermediate portion, both left and right sides of the strap are adjusted simultaneously and equally, ensuring symmetrical alignment while reducing the adjustment process to a single location and time.
Data Source
AI summary
A helmet comprises a shell having a front portion, a rear portion, and a pair of lateral portions extending between the front portion and the rear portion. The shell is sized and configured to be placeable on the head of a user. The helmet additionally includes a chin strap having a pair of end portions and an intermediate portion located between the pair of end portions. The end portions are fixedly connected to respective ones of the pair of lateral portions of the shell so as to restrict movement of the end portions relative to the shell. The chin strap is flexible to facilitate placement of the chin strap around a chin of a user in connection with placement of the shell on the head of the user.