A spring rod helps apply tension to a curtain airbag when deployed along a vehicle side structure and across window openings thereof. The spring rod aids in deployment by tensioning or pulling the curtain airbag into the desired position, so the airbag does not get stuck during deployment. Thereafter, the spring rod tensions the inflated and deployed curtain airbag along the side structure and across the window opening(s) and helps to maintain its position throughout the crash event. This can be especially advantageous for vehicles with large headroom and tall windows.
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"SPRING ROD TENSIONER FOR AIRBAG", Technical Disclosure Commons, (October 12, 2021)