Protective Helmet Visor Chin Strap Sealing Mechanism
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Solution Overview
Problem
Existing protective helmets for motorcyclists face challenges in achieving a perfect seal between the visor and chin strap in the lowered position while allowing the chin strap to be easily raised without rubbing against the visor.
Innovation Solution
The helmet design incorporates a visor that is not only rotatably mounted but also has additional mobility in inclination, interlocked with the chin strap's movement, using a cam mechanism and rod system to ensure the visor can be raised faster and out of the way of the chin strap's upward trajectory, allowing for a secure seal and smooth operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the chin strap is made mobile to allow easy raising, then the ease of operation is improved, but the sealing between visor and chin strap deteriorates
Solution Approach 1:
The patent implements dynamic positioning of the visor through a mobile support zone that can move relative to the chin strap. The visor support zone is connected to the chin strap via a rotational joint, allowing the support zone to pivot and adjust its position dynamically. This enables the system to maintain effective sealing in the lowered position while allowing easy raising when the chin strap is lifted.
Solution Approach 2:
The patent introduces an intermediary mobile support zone between the visor and the chin strap. This support zone acts as a mediator that can rotate relative to both the visor and the chin strap, allowing the chin strap to be raised easily while maintaining the sealing function when lowered. The mobile support zone decouples the direct contact between visor and chin strap, enabling independent movement.
2Reliability
If the visor is positioned to seal perfectly with the chin strap, then the sealing is improved, but the chin strap rubbing against the visor during raising worsens
Solution Approach 1:
The mobile support zone rotates dynamically during the raising motion, allowing the chin strap to clear the visor smoothly. When lowered, the support zone positions the visor to seal perfectly with the chin strap. During raising, the rotational movement of the support zone creates clearance, eliminating rubbing between the chin strap and visor.
Solution Approach 2:
The patent adds a rotational degree of freedom to the support zone, moving the system from a single-dimension contact arrangement to a multi-dimensional configuration. This rotational dimension allows the support zone to pivot out of the way during raising, preventing rubbing while maintaining sealing in the lowered position.
3Object-generated harmful factors
If the chin strap rotational axis is offset to avoid rubbing, then the rubbing is reduced, but the sealing effectiveness deteriorates
Solution Approach 1:
The mobile support zone serves as an intermediary between the chin strap rotational axis and the visor. It allows the chin strap to rotate on its offset axis without the visor being fixed in a position that would cause rubbing. The support zone adjusts its position to maintain sealing while accommodating the offset rotation of the chin strap.
Solution Approach 2:
The mobile support zone dynamically adjusts its position to compensate for the offset rotational axis of the chin strap. When the chin strap is lowered, the support zone positions the visor to seal effectively. When raised, it allows clearance to prevent rubbing, resolving the conflict created by the offset axis.
Data Source
AI summary
The invention concerns a protective helmet comprising a shell (1) whereon are rotatably mounted a visor (2) and a chin strap (3), the lower portion of the visor (2) being urged to rest on a zone (4) of the chin strap (3) when they are lowered and the chin strap (3) capable of being raised about the visor (2). The invention is characterized in that the helmet is such that it comprises additional means for moving the visor (2) configured to bring its lower edge closer to or move it away from the raising trajectory of the support zone (4) on the chin strap (3).