Helmet Strap Buckle with 1:1 Pull-Down Ratio
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Solution Overview
Problem
Conventional helmet straps are cumbersome to adjust and lack security, particularly in emergency situations, as they often require complex buckle systems or two-finger release mechanisms that complicate quick and secure removal.
Innovation Solution
A secure retention system with four independently adjustable straps that attach to the helmet at four positions, featuring a bridging nape pad and strap buckles that can be adjusted with a 1:1 pull-down ratio, allowing for quick tightening or loosening without needing to pass strap ends through buckles, and a two-finger-releasable connecting device for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional buckle systems or two-finger release mechanisms are used to connect strap segments, then security of attachment is improved, but ease of operation deteriorates due to cumbersome adjustment and difficult quick removal
Solution Approach 1:
The retention system divides the strap into multiple segments (first strap segment, second strap segment, third strap segment) that can be independently adjusted and connected through simple interfaces. Each strap segment can be adjusted separately without affecting the others, enabling quick modification of helmet fit while maintaining secure connections through the simplified joining mechanism.
Solution Approach 2:
The invention extracts and eliminates the complex buckle mechanism from the strap connection system. Instead of using traditional buckles or two-finger release mechanisms, the patent employs a simplified joining method where strap segments are directly connected through complementary features (such as loops and hooks), removing the cumbersome intermediate component while maintaining security.
2Adaptability or versatility
If ladder-lock adjustment mechanisms are used to adjust strap length, then adjustability is improved, but device complexity worsens due to multiple components and repositioning requirements
Solution Approach 1:
The adjustment system is segmented into discrete, independently adjustable strap segments. Each segment has its own adjustment capability through simple loop-and-hook interfaces, allowing the wearer to modify the length of individual straps without manipulating a complex centralized adjustment mechanism. This segmentation simplifies the overall device while maintaining full adjustability.
Solution Approach 2:
Instead of using a traditional ladder-lock mechanism where the strap passes through a complex locking structure, the invention inverts the approach by using a simple loop that can be easily engaged and disengaged from a hook or connector. This reversal of the adjustment mechanism eliminates the need for pushing or pulling strap ends through complex structures, making adjustment simpler while maintaining the same adaptability.
3Stability of the object's composition
If strap segments are connected at two positions on each side of the helmet, then stability of helmet fit is improved, but ease of operation deteriorates due to needing to adjust two separate strap segments
Solution Approach 1:
The retention system uses segmented straps with standardized connection interfaces at multiple positions. Each strap segment can be independently adjusted and connected through simple, identical joining mechanisms. This segmentation allows multiple connection points to be implemented without increasing operational complexity, as each connection uses the same simplified interface rather than requiring different adjustment mechanisms for each position.
Solution Approach 2:
The invention employs universal, multi-functional connection interfaces that can be used at multiple positions on the helmet. The same simple joining mechanism (loop and hook/connector) serves all strap connections, regardless of position. This universality allows the system to provide stable multi-point attachment while maintaining ease of operation, as the wearer uses the same simple adjustment method for all straps rather than learning multiple different adjustment mechanisms.
Data Source
AI summary
Strap buckles for headgear can be independently adjusted by single-handed operation while the headgear is worn. To tighten the straps, the wearer pulls a strap buckle toward the chin. The adjustment preferably involves a 1:1 length-adjustment ratio, such that the strap is shortened substantially by the amount the wearer pulls on the buckle.