Bicycle Helmet Visor Snap-Fit Locking Mechanism
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Solution Overview
Problem
Existing bicycle helmets with pivoting sun visors often fail to remain in adjusted positions, especially on uneven terrain, and lack easy adjustment and replacement options.
Innovation Solution
A bicycle helmet design featuring a sun visor with a rotatable attachment system using snap fit fasteners and lock members that allows the visor to be locked into multiple fixed positions, preventing undesired slippage and enabling easy adjustment and potential replacement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a pivoting mechanism with internal clutch is used to allow visor adjustment, then the visor can be adjusted to different positions, but the visor may slowly fall down and fail to remain in a fixed position on uneven terrain
Solution Approach 1:
The visor attachment member is designed to be rotatable relative to the helmet shell, allowing dynamic adjustment between different positions. The rotatable connection enables the visor to move from a fixed to an adjustable state, resolving the contradiction between stability and operability.
Solution Approach 2:
The attachment member allows change in the angular parameter of the visor position. By enabling rotation around a fulcrum point, the visor can achieve different angular positions while maintaining stability at each position through the rotatable connection mechanism.
2Reliability
If a permanently affixed face shield is used, then safety and regulatory requirements are met, but the user cannot remove or replace it
Solution Approach 1:
The face shield system is segmented into the shield itself and the attachment members that connect it to the helmet shell. This segmentation allows the shield to be permanently secured during normal use while enabling removal and replacement when needed, balancing security with adaptability.
Solution Approach 2:
The attachment members provide a dynamic connection that transitions between a locked secure state during use and a removable state when maintenance or replacement is needed. This dynamic attachment mechanism resolves the contradiction between permanent fixation and removable capability.
3Object-affected harmful factors
If an adjustable sun visor is added to provide sun protection, then rider comfort is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The attachment members are merged with the helmet shell structure, integrating the mounting function directly into the existing helmet design. This consolidation reduces overall device complexity by eliminating separate mounting components while still providing adjustable sun protection.
Solution Approach 2:
The attachment members serve multiple functions: they provide structural mounting, enable rotation and adjustment, and allow for potential removal and replacement. This multi-functionality reduces the need for additional specialized components, thereby reducing device complexity while maintaining protective and adjustable capabilities.
Data Source
AI summary
An improved bicycle helmet includes an inner layer having a concave shape, an outer layer having a convex shape, and a sun visor. The outer layer covers the inner layer and includes an outer layer attachment member and an outer layer lock member. The sun visor includes a shade member and a sun visor attachment member connected to and distal to the shade member. The sun visor attachment member is adapted to rotatably engage with the outer layer attachment member to form a fulcrum. The sun visor lock member is adapted to operatively engage the outer layer lock member so as to releasably lock the sun visor into a fixed position. The sun visor lock member and the outer layer lock member operatively engage so as to allow the sun visor to be releasably locked into one of a plurality of fixed positions. the sun visor attachment member and the outer layer attachment member rotatably engage via a snap fit fastener.