Rotatable Shield System for PAPR Helmets
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Solution Overview
Problem
Conventional head protection devices, such as powered air-purifying respirator (PAPR) helmets, require users to remove the entire helmet for tasks like communication or eating, lacking flexibility and comfort for multiple-purpose use.
Innovation Solution
A head protection device with a rotatable shield system that allows users to access their face without removing the helmet, featuring a blower shell and multiple shields that can be adjusted for different modes of operation, including weld, grind, and open face modes, with a hard hat adapter for mounting and customizable components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the entire helmet is removed to access the face, then communication and eating are possible, but flexibility and comfort for multiple-purpose use are reduced
Solution Approach 1:
The shield assembly is divided into multiple independently rotatable shields (outer shield, inner shield, chin shield) that can be individually positioned. This segmentation allows selective face access while maintaining the helmet structure, enabling communication and eating without removing the entire helmet and supporting multiple-purpose use cases.
Solution Approach 2:
The shields are designed with rotational movement capability around pivot points, transforming a static helmet into a dynamic system. Users can rotate shields to open or closed positions based on operational needs, providing flexible face access while maintaining protection, thus improving both ease of operation and adaptability.
2Ease of operation
If the shield is raised to access the face, then communication and eating are enabled, but air flow to the interior may be blocked
Solution Approach 1:
The air flow path is segmented into multiple zones with dedicated openings in the blower shell and shield structure. This allows the shield to be rotated for face access while air flow continues through separate pathways, maintaining both functionality without interference.
Solution Approach 2:
The blower shell acts as an intermediary structure that houses the air moving assembly and provides dedicated air intake and output openings. This intermediary design separates the air flow function from the shield rotation function, ensuring that shield movement for face access does not compromise air supply reliability.
3Adaptability or versatility
If multiple shields are added for different modes of operation, then adaptability is improved, but device complexity increases
Solution Approach 1:
Each shield in the assembly is designed with multi-functionality: they provide protection when closed, enable face access when rotated, and can be positioned for different operational modes (welding, grinding, eating, communication). This universal design achieves adaptability without proportionally increasing complexity, as each component serves multiple purposes.
Solution Approach 2:
The shield assembly uses a nested configuration where the inner shield is positioned within the outer shield's rotation path, and the chin shield is integrated into the lower portion. This nesting allows multiple shields to occupy minimal space when not in use while providing full functionality when needed, managing complexity through compact integration.
Data Source
AI summary
Example hard hat adapters include: a coupling mechanism to removably couple the hard hat adapter to a hard hat; an upper arm configured to removably couple to an outer face shield and an inner face shield; and a lower arm configured to removably couple to a blower shell, wherein the outer face shield and the inner face shield are configured to removably couple to the hard hat adapter at a first pivot point of the hard hat adapter.