Taut unit for seatbelt system, has layer of nitrogen particles formed to inner circumference of taut pipe

摘要

A bendable taut pipe (10) is provided between a piston (18) and a gas generator (20). A layer of nitrogen particles or combination of nitrogen and carbon particles is formed to sections (13,15) of the inner circumference (10a) of the taut pipe by e.g. nitrating process. An independent claim is also included for a method of manufacturing a taut pipe.