Ballistic Helmet Threaded Sleeve Mounting Without Shell Delamination
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Solution Overview
Problem
Existing ballistic protective helmets face issues with securely attaching accessory parts without impairing the protective function, as traditional methods like adhesive or screw connections through the shell lead to delamination and reduced effectiveness.
Innovation Solution
A ballistic protective helmet with a shell made of textile layers connected in a connection matrix, featuring blind holes with threaded sleeves for screwing means, which minimizes delamination and ensures secure attachment of accessory parts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If accessory parts are attached using adhesive or screw connections through the shell, then the attachment is secure and reliable, but the protective function is impaired due to delamination and reduced effectiveness
Solution Approach 1:
The shell is segmented into multiple textile layers connected in a connection matrix, with blind holes created in specific regions. This segmentation allows the attachment structure to be integrated into the shell's layered architecture without compromising the overall protective integrity, as the threads engage multiple layers independently rather than relying on a single through-hole connection.
Solution Approach 2:
The threaded sleeve is nested within the blind hole of the shell, with the screw connection nested within the threaded sleeve. This nested structure allows the attachment mechanism to be contained within the shell's protective layers, preventing the harmful effects of through-hole screw connections while maintaining secure attachment capability.
2Strength
If a bolt passes through the shell to attach accessory parts, then the attachment is strong and stable, but elevated delamination of the textile layers occurs from shearing effect
Solution Approach 1:
The harmful through-hole bolt connection is extracted and replaced with a blind hole threaded sleeve connection. This extraction removes the source of shearing stress that causes delamination, while the threaded sleeve still provides strong attachment capability through engagement with the layered textile structure without passing completely through the shell.
Solution Approach 2:
The threaded sleeve acts as an intermediary element between the accessory part and the shell. Instead of a bolt directly passing through and creating shearing stress on the textile layers, the threaded sleeve mediates the connection by distributing the load across multiple layers through its threading, thereby preventing delamination while maintaining attachment strength.
3Object-affected harmful factors
If the shell is made from multiple textile layers connected in a connection matrix, then the protective effect is improved, but the complexity of attaching accessory parts increases
Solution Approach 1:
Blind holes are pre-formed in the shell during the shell manufacturing process, before accessory parts are attached. Threaded sleeves are then installed in these blind holes. This preliminary preparation simplifies the overall attachment process, as accessory parts can be directly screwed into the pre-prepared threaded sleeves without requiring complex drilling or threading operations on the finished helmet.
Data Source
AI summary
(in connection with FIG. 1)The invention relates to a ballistic protective helmet (10) comprising a shell (21) comprising a shell material that is produced from a number of textile layers (11, 12) connected in a connection matrix.The shell (21) of the protective helmet (10) according to the invention has a blind hole (22), wherein a threaded sleeve (23) has an outer thread (25) that penetrates into the shell material which surrounds the blind hole (22) in a peripheral direction, and wherein the threaded sleeve (23) has an inner thread (26) for connecting to a screwing means (24) having an outer thread (31).