Roll-over protection system for motor car e.g. convertible, has spar that is formed with different wall thicknesses and/or strength along longitudinal direction and is extended in vertical direction from holding device

摘要

The system has a spar (1) which is extended in vertical direction from holding device. The extension movement of the spar is initiated at impending crash so that spar is locked in an extended position. The hollow profile is made of steel material. The spar is formed with different wall thickness and/or strength along longitudinal direction (2).