Helmet Dual-Shell Adjustment Mechanism
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing adjustable helmets face issues with bulky adjustment systems that can be prone to damage, affecting the helmet's appearance and proper functioning, leading to a need for an improved mechanism that is both functional and aesthetically pleasing.
Innovation Solution
A helmet design featuring a dual-shell structure with an actuator that allows relative movement between the shells for adjustment, locking them in place without extending through either shell, utilizing a projection and recess system to secure the fit and prevent movement, thus maintaining the helmet's integrity and appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a traditional adjustment system is used to allow relative movement between shell members, then the helmet fit can be adjusted, but the adjustment system becomes bulky and affects the helmet appearance
Solution Approach 1:
The adjustment system is divided into discrete components: a ratchet mechanism with individual teeth, a separate pawl element, and distributed attachment points on the shell members. This segmentation allows each component to be small and simple, avoiding a bulky integrated system while maintaining full adjustment functionality.
Solution Approach 2:
The pawl is positioned within the ratchet structure, with the pawl's engagement surface nested against the ratchet teeth. This nesting arrangement consolidates the adjustment mechanism into a compact form that does not protrude significantly, reducing the overall bulk of the adjustment system.
2Adaptability or versatility
If a traditional adjustment system is used to allow relative movement between shell members, then the helmet fit can be adjusted, but the adjustment system is prone to damage and deformation
Solution Approach 1:
The ratchet mechanism is divided into multiple individual teeth distributed around the circular path, rather than using a single large adjustment component. This segmentation distributes mechanical stresses across multiple contact points, reducing the likelihood of damage to any single element and improving overall system reliability.
Solution Approach 2:
The ratchet-pawl mechanism provides automatic one-way locking without requiring additional locking components or complex control systems. The pawl automatically engages with the ratchet teeth to maintain adjustment position, and the system self-regulates under load, improving reliability without adding vulnerability points.
3Reliability
If the actuator extends through the shell members to lock them, then the locking function is achieved, but the helmet appearance and integrity are compromised
Solution Approach 1:
The actuator components (ratchet and pawl) are arranged so that the pawl is nested within the ratchet structure, and both are positioned within or flush with the shell member surfaces. This nesting allows the locking function to be achieved without components extending through or protruding from the shell, preserving the helmet's appearance and structural integrity.
Solution Approach 2:
The locking mechanism is merged with the shell member structure itself, where the ratchet is formed as part of or integrated with the shell member, and the pawl is positioned within the same structural plane. This merging eliminates the need for separate extending locking components that would compromise the helmet's appearance.
Data Source
AI summary
A helmet for protecting a wearer's head. The helmet includes an outer shell including a first shell member and a second shell member movable relative to one another in a longitudinal direction of the helmet to adjust a fit of the helmet on the wearer's head. The helmet includes an adjustment mechanism configured to control movement of the first shell member and the second shell member relative to one another. The adjustment mechanism includes an actuator movable between a first position in which the first shell member and the second shell member are allowed to move relative to one another and a second position in which the first shell member and the second shell member are precluded from moving relative to one another. The actuator is configured to lock the first shell member and the second shell member relative to one another without extending through a given one of the first shell member and the second shell member.