Anti-Dazzle Visor Cable Transmission and Retention
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Solution Overview
Problem
Existing safety helmets with anti-dazzle visors suffer from slow operation and high force requirements due to Bowden cables, and lack stability in the raised position, posing risks during vehicle use, especially in changing light conditions.
Innovation Solution
A safety helmet with an anti-dazzle visor mechanism using a motion transmission cable and a sheave or pulley system, combined with elastic return means and temporary retaining mechanisms, allowing easy and low-force operation and maintaining the visor in the raised position despite vibrations or knocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Bowden cables are used to operate the anti-dazzle visor, then the visor can be moved between engagement and disengagement positions, but the operation becomes slow and requires high force
Solution Approach 1:
A cable is introduced as an intermediary element to transmit force from the control slider to the visor. The cable runs through a guide and connects to the visor, allowing force to be applied at a convenient location (the slider) while still moving the visor effectively. This intermediary mechanism resolves the contradiction by enabling both easy operation (force application at slider) and rapid visor movement.
Solution Approach 2:
The operating mechanism is extracted from direct connection between the control element and the visor. By removing the direct mechanical linkage and replacing it with a cable transmission system, the design allows for optimized force application while maintaining rapid response. The cable transmission extracts the force transmission function from the direct mechanical connection, enabling independent optimization of both operation ease and speed.
2Reliability
If the anti-dazzle visor is held in the raised position without retaining means, then the structure remains simple, but the visor may move accidentally due to vibrations or knocks
Solution Approach 1:
The system uses elastic means that automatically engage and disengage based on the visor position. The elastic elements self-regulate by engaging to hold the visor in the raised position and automatically releasing when the visor moves to the lowered position, eliminating the need for complex controlled retaining mechanisms while ensuring reliability.
Solution Approach 2:
The retaining mechanism transitions from a static, always-engaged design to a dynamic system that automatically engages and disengages based on visor position. The elastic means are positioned to engage only when the visor is in the raised position, providing stability when needed while allowing free movement when the visor is lowered, thus balancing reliability and simplicity.
3Stability of the object's composition
If elastic return means are added to maintain the visor in the raised position, then stability improves, but the mechanism becomes more complex
Solution Approach 1:
The elastic means serve themselves by automatically engaging and disengaging based on the visor's position. When the visor is raised, the elastic elements engage to provide stability; when the visor is lowered, they automatically release. This self-regulating behavior provides stability without requiring complex control mechanisms to manage the elastic elements.
Solution Approach 2:
The elastic return means are merged with the existing cable and guide structure. The elastic elements are integrated into the force transmission path, combining the return force function with the existing operating mechanism rather than adding a separate, independent retaining system. This integration minimizes additional complexity while achieving stability.
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
Enables rapid and low-force operation of the anti-dazzle visor and ensures it remains stably in the raised position, enhancing user safety during vehicle use by reducing accidental movements due to vibrations or knocks.
Implementation Method 1
A safety helmet with an anti-dazzle visor mechanism using a motion transmission cable and a sheave or pulley system, combined with elastic return means and temporary retaining mechanisms
Implementation Method 2
A safety helmet with an anti-dazzle visor mechanism using a motion transmission cable and a sheave or pulley system, combined with elastic return means and temporary retaining mechanisms
Data Source
AI summary
Disclosed is a safety helmet having an outer shell, having a front opening, coupled with an inner shell made of shock absorption material, an anti-dazzle visor constrained to the outer shell and movable between a position of engagement and a position of disengagement with the front opening, and an operating portion of the anti-dazzle visor, integral with this latter, and controlled, through a motion transmission cable, by a control slider coupled to a related guide fastened to the outer shell. The control slider is translatable manually between an inactive position and an active position in which the anti-dazzle visor is arranged in a position of engagement. Advantageously, the motion transmission cable has one end integral with the outer she and the other end integral with the control slider, and engages with a drive constrained to the operating portion of the anti-dazzle visor, for movement of this latter.