Hard Hat Face Guard Structure for Cut-Off Tool Kickback
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Solution Overview
Problem
Existing construction helmets do not provide sufficient protection against kickback events from cut-off tools, which can cause severe injuries, and often compromise comfort and ventilation.
Innovation Solution
A face protection accessory with a U-shaped supporting frame and guard bars, anchored above the helmet's base plane, provides enhanced protection by distributing impact energy and incorporating shock-absorbing elements, while maintaining comfort and compatibility with existing helmets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a face protection mask is added to the protective helmet, then protection against kickback events is improved, but the weight and comfort of the helmet deteriorate
Solution Approach 1:
The face protection is segmented into multiple guard bars (first guard bar, second guard bar) arranged in a U-shaped configuration, allowing the protection structure to be distributed across different locations rather than concentrated in one heavy component. This segmentation provides effective kickback protection while minimizing overall weight addition.
Solution Approach 2:
The guard bars are positioned at specific locations (transversal to the U-shaped frame, between cheek-bone portions) where kickback forces are most likely to impact the face. This localized placement of protective elements provides targeted protection without adding weight to areas where protection is not needed.
2Reliability
If a face protection mask is added to the protective helmet, then protection against kickback events is improved, but the comfort and ventilation of the helmet deteriorate
Solution Approach 1:
The U-shaped supporting frame is formed from a thin, lightweight plastic material that provides structural protection while maintaining flexibility. This thin-film approach allows the protection structure to conform to the face without creating bulk that would impede ventilation or comfort.
Solution Approach 2:
The protection is divided into separate guard bars rather than a solid continuous shield, creating gaps between the bars that allow air flow and ventilation while still providing effective protection against kickback forces.
3Reliability
If a bulky face protection mask is used, then protection coverage is improved, but the suitability for construction work deteriorates
Solution Approach 1:
The face protection uses a thin, lightweight plastic frame that forms a compact U-shaped structure rather than a bulky solid mask. This thin-film design provides adequate coverage while maintaining a sleek profile suitable for construction environments where mobility and comfort are essential.
Solution Approach 2:
The face protection accessory is designed to be releasably attachable and removable from the helmet, allowing workers to dynamically adjust or remove the protection when not needed, rather than being permanently fixed in a bulky configuration.
4Object-affected harmful factors
If existing face protection accessories are used, then protection against spray and dust is improved, but protection against kickback events deteriorates
Solution Approach 1:
The guard bars are arranged in a curved U-shaped configuration that follows the contour of the face, creating a more effective barrier against directional kickback forces compared to flat or linear protection designs. The curvature allows the structure to deflect and distribute impact forces more effectively.
Solution Approach 2:
The face protection combines a lightweight plastic U-shaped frame with rigid guard bar elements, creating a composite structure that provides both the flexibility needed for comfort and the rigidity required to resist kickback forces, unlike single-material existing accessories.
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
The accessory effectively mitigates kickback impacts by distributing and absorbing energy, ensuring safety without adding significant weight or discomfort, and allowing integration with various helmet types.
Implementation Method 1
The guard bar and the U-shaped supporting frame together provide sufficient protection for a wearer in case of a kickback event
Data Source
AI summary
A face protection accessory (110) for assembly with a protective helmet (100) to protect a wearer (300) during a cut-off tool kickback event, wherein the accessory (110) comprises a U-shaped supporting frame (115) extending between left and right temple anchoring points (120l, 120r), via left and right check-bone portions (130l, 130r) arranged on either side of the U-shaped supporting frame (115), and a chin portion (140) arranged at a distal end of the accessory (110), where the temple anchoring points (120l, 120r) are configured to attach to the protective helmet (100), and wherein at least a first guard bar (150) extends transversal to the U-shaped supporting frame (115) between the left and the right check-bone portions (130l, 130r).