Error-free metal fastening material feedthrough

Special steel metal pins with controlled elastic deflection and high extraction force address the inefficiencies in metal fastener feedthroughs, enhancing production reliability and assembly in devices like airbag igniters and seatbelt pretensioners.

JP7808396B2Active Publication Date: 2026-01-29SCHOTT AG
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Patent Information

Application Number
JP2024003600
Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
Priority Date
2018-07-20
Filing Date
2024-01-12
Publication Date
2026-01-29
Estimated Expiration
2039-07-15

AI Technical Summary

Technical Problem

Existing metal fastener feedthroughs face challenges in efficient mass production with high defect rates and unreliable assembly, particularly due to the bending and breaking of metal pins during processing and assembly, especially in devices like airbag igniters and seatbelt pretensioners.

Method used

The use of special steel with specific properties, such as EN 10020 standard, for the metal pins, which are annealed to have a maximum elastic deflection of less than 0.21 mm and a high extraction force of 250 N to 400 N, allowing for reliable assembly and reduced deformation during processing.

Benefits of technology

The special steel pins provide enhanced mechanical stability and reliability, reducing defects and improving assembly efficiency, with a 50% higher load-bearing capacity compared to conventional nickel-iron pins, while maintaining a stable glass-to-metal seal.

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Abstract

To provide a metal fixing material feedthrough with a conductor excellent in allowing more reliable assembly when an end product is pushed onto or into a connector.SOLUTION: A metal fixing material feedthrough for igniters of airbags and / or seatbelt pretensioners includes at least one metal pin fused into a glass or a glass-ceramic fixing material in a through-opening of a base body, the metal being present in a post-heated state, with an interface between the fixing material and the metal pin and an additional interface between the fixing material and an inner surface of the through-opening of the base body. The at least one metal pin, at least in its core region, comprises a special steel, preferably a chromium-containing special steel, the special steel having a prescribed thermal expansion coefficient αmetal pin.SELECTED DRAWING: Figure 1a
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